From: Christoph Hellwig <hch@infradead.org>
To: Michael Monnerie <michael.monnerie@is.it-management.at>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH] xfs_repair: multithread phase 2
Date: Mon, 10 Jan 2011 14:18:26 -0500 [thread overview]
Message-ID: <20110110191826.GB25029@infradead.org> (raw)
In-Reply-To: <201101101425.48134@zmi.at>
On Mon, Jan 10, 2011 at 02:25:47PM +0100, Michael Monnerie wrote:
> On Montag, 10. Januar 2011 Dave Chinner wrote:
> > Pretty much
> > every sata disk supports NCQ these days, and default to a depth of
> > 32, which means we can have 32 concurrent reads in progress at once.
> > Phase 2 is all synchronous IO, so the only way to hide the IO
> > latency is to queue work to multiple threads and switch between the
> > threadsto work on another queue when the current one blocks waiting
> > for IO.
>
> This is interesting. Did you measure this with a rotating single disk?
Take a look at the patch description.
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next prev parent reply other threads:[~2011-01-10 19:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-10 0:44 [PATCH] xfs_repair: multithread phase 2 Dave Chinner
2011-01-10 7:57 ` Michael Monnerie
2011-01-10 8:41 ` Dave Chinner
2011-01-10 13:25 ` Michael Monnerie
2011-01-10 19:18 ` Christoph Hellwig [this message]
2011-01-10 19:17 ` Christoph Hellwig
2011-01-10 21:53 ` Matthias Schniedermeyer
2011-01-10 18:55 ` Christoph Hellwig
2011-02-01 23:39 ` Alex Elder
-- strict thread matches above, loose matches on Subject: below --
2011-01-04 6:13 Dave Chinner
2011-01-04 10:02 ` Christoph Hellwig
2011-01-04 12:00 ` Dave Chinner
2011-01-05 23:42 ` Alex Elder
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