cvs commit: src/sys/netinet tcp_var.h

Bjoern A. Zeeb bzeeb-lists at
Sun Jun 18 08:21:55 UTC 2006

On Sun, 18 Jun 2006, Sam Leffler wrote:

> Andre Oppermann wrote:
>> andre       2006-06-17 17:57:36 UTC
>>   FreeBSD src repository
>>   Modified files:
>>     sys/netinet          tcp_var.h
>>   Log:
>>   Rearrange fields in struct syncache and syncache_head to make them more
>>   cache line friendly.
> Got any benchmarks to back this up?  Or perhaps it was just the smiley
> face your cache lines gave you :)

That indeed is a good question. From looking at the patch I can see
a new lock introduced while there are other people working on reducing
locking and locking overhead in our network stack trying different

I hadn't seen a patch or any numbers in this months arch@ or net@
archives (maybe I missed it?).
At the current phase of network stack hacking we should take the
time to get these kind of changes benchmarked under various
loads from different people or at least give them the chance to do
so  so nobody can complain afterwards. At least if one wants to
claim performance improvements.

just my

Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT

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