[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
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
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists