From: Lee Revell <rlrevell@joe-job.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Hugh Dickins <hugh@veritas.com>, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@osdl.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: More latency regressions with 2.6.11-rc4-RT-V0.7.39-02
Date: Wed, 23 Feb 2005 21:24:57 -0500 [thread overview]
Message-ID: <1109211897.4831.2.camel@krustophenia.net> (raw)
In-Reply-To: <421D2DEE.8070209@yahoo.com.au>
On Thu, 2005-02-24 at 12:29 +1100, Nick Piggin wrote:
> Lee Revell wrote:
> >
> > IIRC last time I really tested this a few months ago, the worst case
> > latency on that machine was about 150us. Currently its 422us from the
> > same clear_page_range code path.
> >
> Well it should be pretty trivial to add a break in there.
> I don't think it can get into 2.6.11 at this point though,
> so we'll revisit this for 2.6.12 if the clear_page_range
> optimisations don't get anywhere.
>
Agreed, it would be much better to optimize this away than just add a
scheduling point. It seems like we could do this lazily.
IMHO it's not critical that these latency fixes be merged until the VP
feature gets merged, until then people will be using Ingo's patches
anyway.
Lee
next prev parent reply other threads:[~2005-02-24 2:25 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-23 18:07 More latency regressions with 2.6.11-rc4-RT-V0.7.39-02 Lee Revell
2005-02-23 19:16 ` Hugh Dickins
2005-02-23 19:36 ` Lee Revell
2005-02-23 20:06 ` Hugh Dickins
2005-02-23 20:10 ` Lee Revell
2005-02-23 20:30 ` Lee Revell
2005-02-23 21:03 ` Hugh Dickins
2005-02-23 22:14 ` Lee Revell
2005-02-23 23:52 ` PPC RT Patch john cooper
2005-02-24 4:20 ` Frank Rowand
2005-02-24 13:56 ` john cooper
2005-02-23 23:27 ` More latency regressions with 2.6.11-rc4-RT-V0.7.39-02 Nick Piggin
2005-02-24 1:03 ` Lee Revell
2005-02-24 1:29 ` Nick Piggin
2005-02-24 2:24 ` Lee Revell [this message]
2005-02-24 2:41 ` Nick Piggin
2005-02-24 3:03 ` Lee Revell
2005-02-23 20:53 ` Hugh Dickins
2005-02-23 22:13 ` Lee Revell
2005-02-24 4:56 ` Hugh Dickins
2005-02-24 6:32 ` Lee Revell
2005-02-24 8:26 ` Hugh Dickins
2005-02-25 3:30 ` Lee Revell
2005-02-25 5:58 ` Hugh Dickins
2005-02-25 15:02 ` Lee Revell
2005-02-23 19:52 ` Lee Revell
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