linux-kernel - Re: [tbench regression fixes]: digging out smelly deadmen.

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Date:	Fri, 10 Oct 2008 12:09:10 +0400
From:	Evgeniy Polyakov <s0mbre@...rvice.net.ru>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, David Miller <davem@...emloft.net>
Subject: Re: [tbench regression fixes]: digging out smelly deadmen.

Hi Peter.

I've enabled kernel hacking option and scheduler debugging and turned
off hrticks and performance jumped to 382 MB/s:

vanilla 27: 347.222
no TSO/GSO: 357.331
no hrticks: 382.983

I use tsc clocksource, also available acpi_pm and jiffies,
with acpi_pm performance is even lower (I stopped test after it dropped
below 340 MB/s mark), jiffies do not work at all, looks like sockets
stuck in time_wait state when this clock source is used, although that
may be some different issue.

So I think hrticks are guilty, but still not as good as .25 tree without
mentioned changes (455 MB/s) and .24 (475 MB/s).

-- 
	Evgeniy Polyakov
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