Re: NSD 4.1.18rc1 pre-release

"W.C.A. Wijngaards" <[email protected]> Thu, 16 Nov 2017 12:00:50 +0100

Newsgroups	gmane.network.dns.nsd.general
Message-ID	<[email protected]>

Hi Paul,

On 16/11/17 11:57, Paul Wouters wrote:
> 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.

Best regards, Wouter

> 
> I'm trying to make the determination for RHEL/CentOS/Fedora on whether
> I want this compile time option enabled or not.
> 
> Paul

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