[nsd-users] NSD 4.1.18rc1 pre-release
paul at nohats.ca
Thu Nov 16 11:07:09 UTC 2017
On Thu, 16 Nov 2017, W.C.A. Wijngaards wrote:
>>> This release has features for saving memory and faster notification.
>>> With --enable-packed, 33% memory savings could be had, or something
>>> along that size. Notification of secondary servers happens in parallel,
>>> and has faster timeouts. More sockets are used for zone transfers.
>>> This speeds up communication with a larger set of servers.
>> What is the downside of this option? I assume there is one, because
>> otherwise this would not be a compile time option?
> Packed structures are more difficult to access by the compiler. It is
> likely that the compiler needs to generate more code to access members
> in the data structure. The assumption that data is aligned in memory is
> not there. The compiler will generate different code. Because it is
> packed, it'll use less memory, but that code also has to be executed. I
> don't know what the speed impact is, if any.
Okay, so that does not really help me to determine:
>> I'm trying to make the determination for RHEL/CentOS/Fedora on whether
>> I want this compile time option enabled or not.
which I guess is why this is a compile time option :)
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