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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Hi Stephan,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thanks. It indeed seems like LRU is happening. The RAM number was a typo – I had 6.5GBytes (not Mbytes) free while even at peak load unbound was taking <50-100Mbytes of RAM across all of its components. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>With sufficient memory and my setup below, can you see why least-recently used entries are forced to be purged from cache? <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>To work-around this behavior, I am running a continuous scan instead of an hourly cronjob so my LRU entries get re-queried every 25mins instead of every 60mins. With a 80% prefetch, 3600 cache-min-ttl, I am now able to get 40-80ms avg response times mostly from the cache. However, the down side now is a steady 40-50% cpu load given all the scanning. I definitely have a very inefficient setup right now to get my response times down to ~50ms.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Would love to see how else I can keep my oldest entries from being purged from cache if memory and cache-min-ttl are large enough.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Vinay.<o:p></o:p></span></p><p class=MsoNormal><a name="_MailEndCompose"><span style='color:#1F497D'><o:p> </o:p></span></a></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Stephan Lagerholm [mailto:stephan.lagerholm@secure64.com] <br><b>Sent:</b> Monday, July 09, 2012 6:35 AM<br><b>To:</b> vinay3@justemail.net; unbound-users@unbound.net<br><b>Subject:</b> RE: [Unbound-users] Improve avg response times<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Hi Vinay,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The unbound name server is using the Least resent used (LRU) algorithm to decide what to throw out when the cache gets full. There is no ‘garbage collection’ like in Bind. Doing this like unbound does it should be somewhat faster and nicer to the processor, but the flip-side is that prefetching is not working that very well (good stuff might get thrown out when prefetching). <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I notice that you don’t have that much memory. Maybe your memory is only large enough for say 10 minutes of cached entries. If nobody is asking for <a href="http://www.utorrent.com">www.utorrent.com</a> during those 10 minutes, then it will be kicked out. Try to increase your cache memory size or ask more often for the site that you want to make sure you have cached.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>/Stephan<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <a href="mailto:unbound-users-bounces@unbound.net">unbound-users-bounces@unbound.net</a> <a href="mailto:[mailto:unbound-users-bounces@unbound.net]">[mailto:unbound-users-bounces@unbound.net]</a> <b>On Behalf Of </b><a href="mailto:vinay3@justemail.net">vinay3@justemail.net</a><br><b>Sent:</b> Saturday, July 07, 2012 1:55 PM<br><b>To:</b> <a href="mailto:unbound-users@unbound.net">unbound-users@unbound.net</a><br><b>Subject:</b> Re: [Unbound-users] Improve avg response times<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>I tried using a prefetch trigger at 90% instead of 10% (intentionally inefficient) and a cache-min-ttl of 5400 so that an hourly scan is guaranteed to find a cached entry from the last scan and will also reset it’s TTL back to 5400 by forcing a new iteration.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>If I do a new namebench run, I still get a 150ms+ avg response time and I see several responses that have a TTL of 5400 meaning they were cachemisses. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=2042 style='width:1225.35pt;margin-left:-.75pt;border-collapse:collapse'><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>blog.sina.com.cn.<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>A<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>814.8959<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>5400<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>2<o:p></o:p></span></p></td><td width=1179 nowrap colspan=4 valign=bottom style='width:707.5pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>blogx.sina.com.cn. -> 218.30.115.254<o:p></o:p></span></p></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'><a href="http://www.utorrent.com">www.utorrent.com</a>.<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>A<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>203.908<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>5400<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>1<o:p></o:p></span></p></td><td width=590 nowrap colspan=2 valign=bottom style='width:353.8pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>67.215.233.130<o:p></o:p></span></p></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>in.youtube.com.<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>A<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>29.46731<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>2982<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>2<o:p></o:p></span></p></td><td width=1474 nowrap colspan=5 valign=bottom style='width:884.35pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>youtube-ui.l.google.com. -> 74.125.224.46, 74.125.224.32, 74.125.224.33, 74.125.224.34, 74.125.224.35, 74.125.224.36, 74.125.224.37, 74.125.224.38, 74.125.224.39, 74.125.224.40, 74.125.224.41<o:p></o:p></span></p></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>search.mywebsearch.com.<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>A<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>72.6796<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>2985<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>2<o:p></o:p></span></p></td><td width=1474 nowrap colspan=5 valign=bottom style='width:884.35pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>www154.mywebsearch.com. -> 74.113.233.48<o:p></o:p></span></p></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>wenwen.soso.com.<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>A<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>296.7475<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>5236<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>1<o:p></o:p></span></p></td><td width=590 nowrap colspan=2 valign=bottom style='width:353.8pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>202.55.10.153<o:p></o:p></span></p></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'><a href="http://www.uploading.com">www.uploading.com</a>.<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>A<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>26.0509<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>3007<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>1<o:p></o:p></span></p></td><td width=590 nowrap colspan=2 valign=bottom style='width:353.8pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>195.191.207.40<o:p></o:p></span></p></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.9pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td><td width=295 nowrap valign=bottom style='width:176.85pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'></td></tr><tr style='height:.2in'><td width=248 nowrap valign=bottom style='width:149.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'><a href="http://www.ebay.com">www.ebay.com</a>.<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>A<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>31.4418<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>5400<o:p></o:p></span></p></td><td width=80 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>1<o:p></o:p></span></p></td><td width=1474 nowrap colspan=5 valign=bottom style='width:884.35pt;padding:0in 5.4pt 0in 5.4pt;height:.2in'><p class=MsoNormal><span style='color:black'>66.135.200.161, 66.135.200.181, 66.135.210.61, 66.135.210.181, 66.211.181.161, 66.211.181.181<o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>So this is appearing like unexpected behavior to me: If <a href="http://www.utorrent.com">www.utorrent.com</a> was scanned less than an hour ago and was supposed to be cached for 5400 seconds, why would a random scan like the one above find it flushed out of the cache (5400 TTL) and requiring an iteration (203.9 msecs response time)?<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>