From: Andrew Morton <akpm@osdl.org>
To: Badari Pulavarty <pbadari@us.ibm.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: 2.6.12-rc6-mm1 & 2K lun testing
Date: Thu, 16 Jun 2005 17:51:30 -0700 [thread overview]
Message-ID: <20050616175130.22572451.akpm@osdl.org> (raw)
In-Reply-To: <1118965381.4301.488.camel@dyn9047017072.beaverton.ibm.com>
Badari Pulavarty <pbadari@us.ibm.com> wrote:
>
> > Try this:
> >
> > diff -puN mm/page-writeback.c~a mm/page-writeback.c
> > --- 25/mm/page-writeback.c~a Thu Jun 16 13:36:29 2005
> > +++ 25-akpm/mm/page-writeback.c Thu Jun 16 13:36:54 2005
> > @@ -501,6 +501,8 @@ void laptop_sync_completion(void)
> >
> > static void set_ratelimit(void)
> > {
> > + ratelimit_pages = 32;
> > + return;
> > ratelimit_pages = total_pages / (num_online_cpus() * 32);
> > if (ratelimit_pages < 16)
> > ratelimit_pages = 16;
> > _
> >
>
> Wow !! Reducing the dirty ratios and the above patch did the trick.
> Instead of 100% sys CPU, now I have only 50% in sys.
It shouldn't be necessary to do both. Either the patch or the tuning
should fix it. Please confirm.
Also please determine whether the deep CFQ queue depth is a problem when
the VFS tuning/patching is in place.
IOW: let's work out which of these three areas needs to be addressed.
next prev parent reply other threads:[~2005-06-17 0:52 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-15 17:36 2.6.12-rc6-mm1 & 2K lun testing Badari Pulavarty
2005-06-15 18:30 ` Nick Piggin
2005-06-15 18:30 ` Badari Pulavarty
2005-06-15 19:02 ` Nick Piggin
2005-06-15 20:56 ` Badari Pulavarty
2005-06-16 1:48 ` Nick Piggin
2005-06-15 23:23 ` Dave Chinner
2005-06-15 21:39 ` Chen, Kenneth W
2005-06-15 22:35 ` Badari Pulavarty
2005-06-16 7:24 ` Andrew Morton
2005-06-16 19:50 ` Badari Pulavarty
2005-06-16 20:37 ` Andrew Morton
2005-06-16 23:43 ` Badari Pulavarty
2005-06-17 0:51 ` Andrew Morton [this message]
2005-06-17 15:10 ` Badari Pulavarty
2005-06-17 21:13 ` Andrew Morton
2005-06-22 0:34 ` 2.6.12-mm1 & 2K lun testing (JFS problem ?) Badari Pulavarty
2005-06-22 1:41 ` William Lee Irwin III
2005-06-22 16:23 ` Badari Pulavarty
2005-06-22 13:50 ` Dave Kleikamp
2005-06-22 16:56 ` Badari Pulavarty
2005-06-22 21:02 ` Badari Pulavarty
2005-06-16 22:42 ` 2.6.12-rc6-mm1 & 2K lun testing William Lee Irwin III
2005-06-16 22:25 ` Badari Pulavarty
2005-06-16 22:58 ` William Lee Irwin III
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