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Date: Thu, 21 Apr 2011 14:08:05 -0400
From: Christoph Hellwig <hch@...radead.org>
To: Chris Mason <chris.mason@...cle.com>
Cc: Christoph Hellwig <hch@...radead.org>,
Andreas Dilger <adilger@...ger.ca>,
linux-fsdevel <linux-fsdevel@...r.kernel.org>,
linux-ext4 <linux-ext4@...r.kernel.org>, xfs <xfs@....sgi.com>,
jack <jack@...e.cz>, axboe <axboe@...nel.dk>,
dchinner <dchinner@...hat.com>
Subject: Re: buffered writeback torture program
On Thu, Apr 21, 2011 at 02:02:43PM -0400, Chris Mason wrote:
> For this program, they are almost all dirty pages.
>
> I tried patching it to give up if we seek but it is still pretty slow.
> There's something else going on in addition to the xfs clustering being
> too aggressive.
I'm not sure where you this beeing to agressive from - it's doing
exactly the same amount of I/O as a filesystem writing out a single
page from ->writepage or using write_cache_pages (either directly
or as a copy) as ->writepages. The only thing special compared to
the no ->writepages case is that it's submitting a large I/O
from the first ->writepage call.
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