From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
"David S. Miller" <davem@davemloft.net>,
Andrew Morton <akpm@osdl.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch][rfc] optimise resched, idle task
Date: Sun, 03 Apr 2005 23:27:45 +1000 [thread overview]
Message-ID: <424FEF51.9020104@yahoo.com.au> (raw)
In-Reply-To: <424E11C6.8090702@yahoo.com.au>
Nick Piggin wrote:
> This actually improves performance noticably (ie. a % or so) on schedule /
> wakeup happy benchmarks (tbench, on a dual Xeon with HT using mwait idle).
>
Here are some numbers on a 2 socket Xeon with HT and mwait idle.
Average of 3 runs, tbench, single client and single server processes on:
samethread samecpu othercpu
before patch: 188.684 MB/s 189.237 MB/s 172.306 MB/s
after patch : 188.425 MB/s 191.628 MB/s 174.224 MB/s
The improvement on other CPUs should be due to the removal of
RMW operations in resched_task.
prev parent reply other threads:[~2005-04-03 13:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-02 3:30 [patch][rfc] optimise resched, idle task Nick Piggin
2005-04-03 13:27 ` Nick Piggin [this message]
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