From: Lee Revell <rlrevell@joe-job.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>, "Jack O'Quin" <joq@io.com>
Subject: Re: Latency tests with 2.6.12-rc1
Date: Sat, 19 Mar 2005 02:51:42 -0500 [thread overview]
Message-ID: <1111218702.13039.5.camel@mindpipe> (raw)
In-Reply-To: <20050319070810.GA20059@elte.hu>
On Sat, 2005-03-19 at 08:08 +0100, Ingo Molnar wrote:
> great! The change in question is most likely the copy_page_range() fix
> that Hugh resurrected:
>
> ChangeSet 1.2037, 2005/03/08 09:26:46-08:00, hugh@veritas.com
>
> [PATCH] copy_pte_range latency fix
>
> Ingo's patch to reduce scheduling latencies, by checking for lockbreak in
> copy_page_range, was in the -VP and -mm patchsets some months ago; but got
> preempted by the 4level rework, and not reinstated since. Restore it now
> in copy_pte_range - which mercifully makes it easier.
>
> are the ext3 related latencies are gone as well - or are you working it
> around by not using data=ordered?
As a matter of fact the ext3 latencies do not appear to be causing
problems, at least not at those settings, even with data=ordered.
It's impossible to tell much more because the mainline kernel lacks the
instrumentation that the realtime patchset provides.
Lee
next prev parent reply other threads:[~2005-03-19 7:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-19 4:03 Latency tests with 2.6.12-rc1 Lee Revell
2005-03-19 7:08 ` Ingo Molnar
2005-03-19 7:51 ` Lee Revell [this message]
2005-03-19 21:56 ` Lee Revell
2005-03-22 8:22 ` Ingo Molnar
2005-03-23 22:12 ` Lee Revell
2005-03-24 17:13 ` Lee Revell
2005-03-31 8:02 ` Ingo Molnar
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