From: Theodore Tso <tytso@mit.edu>
To: Chris Mason <chris.mason@oracle.com>,
Christoph Hellwig <hch@infradead.org>,
linux-mm@kvack.org,
Ext4 Developers List <linux-ext4@vger.kernel.org>,
linux-fsdevel@vger.kernel.org, jens
Subject: Re: [PATCH, RFC] vm: Add an tuning knob for vm.max_writeback_pages
Date: Tue, 1 Sep 2009 16:30:22 -0400 [thread overview]
Message-ID: <20090901203022.GD6996@mit.edu> (raw)
In-Reply-To: <20090901180052.GA7885@think>
On Tue, Sep 01, 2009 at 02:00:52PM -0400, Chris Mason wrote:
>
> I haven't yet tried this without the max_writeback_pages patch, but the
> graphs clearly show a speed improvement, and that the mainline code is
> smearing writes across the drive while Jens' work is writing
> sequentially.
FYI, you don't need to revert the max_writebacks_pages patch; the
whole point of making it a tunable was to make it easier to run
benchmarks. If you want to get the effects of the original setting of
MAX_WRITEBACK_PAGES before the patch, just run as root:
sysctl vm.max_writeback_pages=1024
- Ted
WARNING: multiple messages have this Message-ID (diff)
From: Theodore Tso <tytso@mit.edu>
To: Chris Mason <chris.mason@oracle.com>,
Christoph Hellwig <hch@infradead.org>,
linux-mm@kvack.org,
Ext4 Developers List <linux-ext4@vger.kernel.org>,
linux-fsdevel@vger.kernel.org, jens.axboe@oracle.com
Subject: Re: [PATCH, RFC] vm: Add an tuning knob for vm.max_writeback_pages
Date: Tue, 1 Sep 2009 16:30:22 -0400 [thread overview]
Message-ID: <20090901203022.GD6996@mit.edu> (raw)
In-Reply-To: <20090901180052.GA7885@think>
On Tue, Sep 01, 2009 at 02:00:52PM -0400, Chris Mason wrote:
>
> I haven't yet tried this without the max_writeback_pages patch, but the
> graphs clearly show a speed improvement, and that the mainline code is
> smearing writes across the drive while Jens' work is writing
> sequentially.
FYI, you don't need to revert the max_writebacks_pages patch; the
whole point of making it a tunable was to make it easier to run
benchmarks. If you want to get the effects of the original setting of
MAX_WRITEBACK_PAGES before the patch, just run as root:
sysctl vm.max_writeback_pages=1024
- Ted
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next prev parent reply other threads:[~2009-09-01 20:30 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-30 2:54 [PATCH, RFC] vm: Add an tuning knob for vm.max_writeback_pages Theodore Ts'o
2009-08-30 2:54 ` Theodore Ts'o
2009-08-30 16:52 ` Christoph Hellwig
2009-08-30 16:52 ` Christoph Hellwig
2009-08-30 18:17 ` Theodore Tso
2009-08-30 18:17 ` Theodore Tso
2009-08-30 22:27 ` Christoph Hellwig
2009-08-30 22:27 ` Christoph Hellwig
2009-08-31 3:08 ` Theodore Tso
2009-08-31 3:08 ` Theodore Tso
2009-08-31 10:29 ` Jens Axboe
2009-08-31 10:29 ` Jens Axboe
2009-08-31 10:47 ` Jens Axboe
2009-08-31 10:47 ` Jens Axboe
2009-08-31 12:37 ` Theodore Tso
2009-08-31 12:37 ` Theodore Tso
2009-08-31 15:54 ` Theodore Tso
2009-08-31 20:36 ` Jens Axboe
2009-08-31 21:03 ` Theodore Tso
2009-09-01 7:57 ` Aneesh Kumar K.V
2009-09-01 9:17 ` Jens Axboe
2009-09-01 18:00 ` Chris Mason
2009-09-01 20:30 ` Theodore Tso [this message]
2009-09-01 20:30 ` Theodore Tso
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