From: Rik van Riel <riel@redhat.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: kosaki.motohiro@jp.fujitsu.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, akpm@linux-foundation.org
Subject: Re: PERF: performance tests with the split LRU VM in -mm
Date: Tue, 29 Jul 2008 09:16:50 -0400 [thread overview]
Message-ID: <20080729091650.0ddca3d8@bree.surriel.com> (raw)
In-Reply-To: <20080729220012.F192.KOSAKI.MOTOHIRO@jp.fujitsu.com>
On Tue, 29 Jul 2008 22:04:16 +0900
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:
> > TEST 1: dd if=/dev/sda of=/dev/null bs=1M
> >
> > kernel speed swap used
> >
> > 2.6.26 111MB/s 500kB
> > -mm 110MB/s 59MB (ouch, system noticably slower)
> > noforce 111MB/s 128kB
> > stream 108MB/s 0 (slight regression, not sure why yet)
>
> I tried to reproduce it, my ia64 result was
>
> kernel speed swap used
> 2.6.26-rc8 49.8MB/s 1M
> 2.6.26-rc8-mm1 47.6MB/s 168M
> -mm with above two patch 50.2MB/s 0
>
>
> So, I think it isn't regression.
Agreed. It looked like it, but once I changed the cpuspeed
governor from ondemand to performance, I saw that it had to
be an artifact of something else.
Getting rid of the swap use from a linear IO is the important
part.
--
All rights reversed.
WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@redhat.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
akpm@linux-foundation.org
Subject: Re: PERF: performance tests with the split LRU VM in -mm
Date: Tue, 29 Jul 2008 09:16:50 -0400 [thread overview]
Message-ID: <20080729091650.0ddca3d8@bree.surriel.com> (raw)
In-Reply-To: <20080729220012.F192.KOSAKI.MOTOHIRO@jp.fujitsu.com>
On Tue, 29 Jul 2008 22:04:16 +0900
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:
> > TEST 1: dd if=/dev/sda of=/dev/null bs=1M
> >
> > kernel speed swap used
> >
> > 2.6.26 111MB/s 500kB
> > -mm 110MB/s 59MB (ouch, system noticably slower)
> > noforce 111MB/s 128kB
> > stream 108MB/s 0 (slight regression, not sure why yet)
>
> I tried to reproduce it, my ia64 result was
>
> kernel speed swap used
> 2.6.26-rc8 49.8MB/s 1M
> 2.6.26-rc8-mm1 47.6MB/s 168M
> -mm with above two patch 50.2MB/s 0
>
>
> So, I think it isn't regression.
Agreed. It looked like it, but once I changed the cpuspeed
governor from ondemand to performance, I saw that it had to
be an artifact of something else.
Getting rid of the swap use from a linear IO is the important
part.
--
All rights reversed.
--
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next prev parent reply other threads:[~2008-07-29 13:17 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-25 2:25 PERF: performance tests with the split LRU VM in -mm Rik van Riel
2008-07-25 2:25 ` Rik van Riel
2008-07-28 14:57 ` Rik van Riel
2008-07-28 14:57 ` Rik van Riel
2008-07-28 15:30 ` Ray Lee
2008-07-28 15:30 ` Ray Lee
2008-07-28 23:41 ` Andrew Morton
2008-07-28 23:41 ` Andrew Morton
2008-07-28 23:57 ` Rik van Riel
2008-07-28 23:57 ` Rik van Riel
2008-07-29 0:03 ` Rik van Riel
2008-07-29 0:03 ` Rik van Riel
2008-07-29 0:17 ` Andrew Morton
2008-07-29 0:17 ` Andrew Morton
2008-07-29 0:31 ` Rik van Riel
2008-07-29 0:31 ` Rik van Riel
2008-07-29 0:46 ` Lee Schermerhorn
2008-07-29 0:46 ` Lee Schermerhorn
2008-07-29 13:21 ` Johannes Weiner
2008-07-29 13:21 ` Johannes Weiner
2008-07-29 13:28 ` Rik van Riel
2008-07-29 13:28 ` Rik van Riel
2008-07-29 13:04 ` KOSAKI Motohiro
2008-07-29 13:04 ` KOSAKI Motohiro
2008-07-29 13:16 ` Rik van Riel [this message]
2008-07-29 13:16 ` Rik van Riel
2008-07-29 13:51 ` Johannes Weiner
2008-07-29 13:51 ` Johannes Weiner
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