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Re: [PATCH] bump up nr_to_write in xfs_vm_writepage

To: Olaf Weber <olaf@xxxxxxx>
Subject: Re: [PATCH] bump up nr_to_write in xfs_vm_writepage
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 7 Jul 2009 06:19:46 -0400
Cc: Eric Sandeen <sandeen@xxxxxxxxxx>, xfs mailing list <xfs@xxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, "MASON, CHRISTOPHER" <CHRIS.MASON@xxxxxxxxxx>
In-reply-to: <bzyd48cc14d.fsf@xxxxxxxxxxxxxxxxxxxx>
References: <4A4D26C5.9070606@xxxxxxxxxx> <bzyd48cc14d.fsf@xxxxxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.18 (2008-05-17)
On Tue, Jul 07, 2009 at 11:07:30AM +0200, Olaf Weber wrote:
> If the nr_to_write calculation really yields a value that is too
> small, shouldn't it be fixed elsewhere?

In theory it should.  But given the amazing feedback of the VM people
on this I'd rather make sure we do get the full HW bandwith on large
arrays instead of sucking badly and not just wait forever.

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