From: Dave Chinner <david@fromorbit.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 5/5] repair: limit auto-striding concurrency apprpriately
Date: Fri, 13 Dec 2013 08:00:40 +1100 [thread overview]
Message-ID: <20131212210040.GB10988@dastard> (raw)
In-Reply-To: <20131212182908.GD10092@infradead.org>
On Thu, Dec 12, 2013 at 10:29:08AM -0800, Christoph Hellwig wrote:
> Looks reasonable, but it might be worth to add a blurb on how you
> arrived at the magic 8 threads per cpu.
OK - that was simply that processing with 8 threads is more than
enough to saturate a single CPU on fast devices so we don't need any
more parallelism in this case. And when you have large slow devices,
8 threads is more than enough to saturate the IO subsystem....
I'll add a comment mentioning that.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2013-12-12 21:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-12 7:22 [PATCH 0/5] xfs_repair: scalability inmprovements Dave Chinner
2013-12-12 7:22 ` [PATCH 1/5] repair: translation lookups limit scalability Dave Chinner
2013-12-12 18:26 ` Christoph Hellwig
2013-12-12 18:58 ` Brian Foster
2013-12-12 7:22 ` [PATCH 2/5] repair: per AG locks contend for cachelines Dave Chinner
2013-12-12 18:27 ` Christoph Hellwig
2013-12-12 18:58 ` Brian Foster
2013-12-12 20:46 ` Dave Chinner
2013-12-12 7:22 ` [PATCH 3/5] repair: phase 6 is trivially parallelisable Dave Chinner
2013-12-12 18:43 ` Christoph Hellwig
2013-12-12 20:53 ` Dave Chinner
2013-12-12 18:59 ` Brian Foster
2013-12-12 7:22 ` [PATCH 4/5] libxfs: buffer cache hashing is suboptimal Dave Chinner
2013-12-12 18:28 ` Christoph Hellwig
2013-12-12 18:59 ` Brian Foster
2013-12-12 20:56 ` Dave Chinner
2013-12-13 14:23 ` Brian Foster
2013-12-12 7:22 ` [PATCH 5/5] repair: limit auto-striding concurrency apprpriately Dave Chinner
2013-12-12 18:29 ` Christoph Hellwig
2013-12-12 21:00 ` Dave Chinner [this message]
2013-12-12 18:59 ` Brian Foster
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