[nsd-users] Ignored IPv6 requests

[W.C.A. Wijngaards]

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Hi Ondrej,

On 02/03/2014 05:03 PM, Ondřej Surý wrote:
> On Mon, Jan 27, 2014, at 15:41, W.C.A. Wijngaards wrote:
>>> Could it be because of something else than NSD? At the same
>>> moment, I switched to Linux kernel 3.12.6 on a Linode VPS. Any
>>> similar problems with this setup? (If I have time, I will try
>>> with Knot, to compare and to see if it's the fault of the
>>> kernel.)
>> 
>> It'll be recvmmsg.  Not sure if Knot uses that.  The kernel
>> version may or may not have fixes for it, I guess, so the kernel
>> version could be important here.
> 
> Knot DNS uses recvmmsg as well on Linux kernels. And we would be 
> interested in hearing the results of this test.

I also saw bug reports from NetBSD (which has recvmmsg in recent/devel
kernels?).  It simply failed or looped forever.

>> perhaps perform a linux kernel-version check in configure
> 
> That's futile – you would have to do the run time check for kernel 
> version and switch the implementation on run time.

Yes, for me, today, that means we disable it by default and leave it
until it is fixed in kernels.  Good replies are more important than
that handful of percents in performance...

Best regards,
   Wouter

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