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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Nathan Scott <nathans@sgi.com>
Cc: Andrew Morton <akpm@osdl.org>,
	piggin@cyberone.com.au, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, linux-xfs@oss.sgi.com
Subject: Re: Page cache write performance issue
Date: Thu, 14 Oct 2004 17:31:59 +1000	[thread overview]
Message-ID: <416E2B6F.5040803@yahoo.com.au> (raw)
In-Reply-To: <20041014071659.GB1768@frodo>

Nathan Scott wrote:
> On Wed, Oct 13, 2004 at 08:20:41PM -0700, Andrew Morton wrote:
> 
>>Nathan Scott <nathans@sgi.com> wrote:
>>
>>> I just tried switching CONFIG_HIGHMEM off, and so running the
>>> machine with 512MB; then adjusted the test to write 256M into
>>> the page cache, again in 1K sequential chunks.  A similar mis-
>>> behaviour happens, though the numbers are slightly better (up
>>> from ~4 to ~6.5MB/sec).  Both ext2 and xfs see this.  When I
>>> drop the file size down to 128M with this kernel, I see good
>>> results again (as we'd expect).
>>
>>No such problem here, with
>>
>>	dd if=/dev/zero of=x bs=1k count=128k
>>
>>on a 256MB machine.  xfs and ext2.
> 
> 
> Yup, rebooted with mem=128M and on my box, & that crawls.
> Maybe its just this old hunk 'o junk, I suppose; odd that
> 2.6.8 was OK with this though.
> 

Just out of interest, can you get profiles and a few lines
of vmstat 1 from 2.6.8 and 2.6.9-rc, please?

WARNING: multiple messages have this Message-ID (diff)
From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Nathan Scott <nathans@sgi.com>
Cc: Andrew Morton <akpm@osdl.org>,
	piggin@cyberone.com.au, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, linux-xfs@oss.sgi.com
Subject: Re: Page cache write performance issue
Date: Thu, 14 Oct 2004 17:31:59 +1000	[thread overview]
Message-ID: <416E2B6F.5040803@yahoo.com.au> (raw)
In-Reply-To: <20041014071659.GB1768@frodo>

Nathan Scott wrote:
> On Wed, Oct 13, 2004 at 08:20:41PM -0700, Andrew Morton wrote:
> 
>>Nathan Scott <nathans@sgi.com> wrote:
>>
>>> I just tried switching CONFIG_HIGHMEM off, and so running the
>>> machine with 512MB; then adjusted the test to write 256M into
>>> the page cache, again in 1K sequential chunks.  A similar mis-
>>> behaviour happens, though the numbers are slightly better (up
>>> from ~4 to ~6.5MB/sec).  Both ext2 and xfs see this.  When I
>>> drop the file size down to 128M with this kernel, I see good
>>> results again (as we'd expect).
>>
>>No such problem here, with
>>
>>	dd if=/dev/zero of=x bs=1k count=128k
>>
>>on a 256MB machine.  xfs and ext2.
> 
> 
> Yup, rebooted with mem=128M and on my box, & that crawls.
> Maybe its just this old hunk 'o junk, I suppose; odd that
> 2.6.8 was OK with this though.
> 

Just out of interest, can you get profiles and a few lines
of vmstat 1 from 2.6.8 and 2.6.9-rc, please?
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  reply	other threads:[~2004-10-14  8:01 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-10-13  5:44 Page cache write performance issue Nathan Scott
2004-10-13  5:44 ` Nathan Scott
2004-10-13  6:19 ` Andrew Morton
2004-10-13  6:19   ` Andrew Morton
2004-10-13  6:39   ` Nathan Scott
2004-10-13  6:39     ` Nathan Scott
2004-10-13  7:02     ` Andrew Morton
2004-10-13  7:02       ` Andrew Morton
2004-10-13  7:23       ` Nathan Scott
2004-10-13  7:23         ` Nathan Scott
2004-10-13  8:15         ` Nick Piggin
2004-10-13  8:15           ` Nick Piggin
2004-10-13  8:39           ` Andrew Morton
2004-10-13  8:39             ` Andrew Morton
2004-10-14  0:53             ` Nathan Scott
2004-10-14  0:53               ` Nathan Scott
2004-10-14  3:20               ` Andrew Morton
2004-10-14  3:20                 ` Andrew Morton
2004-10-14  7:16                 ` Nathan Scott
2004-10-14  7:16                   ` Nathan Scott
2004-10-14  7:31                   ` Nick Piggin [this message]
2004-10-14  7:31                     ` Nick Piggin

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