linux-kernel - Re: direct-io regression [Was: How to track down abysmal performance ata - raid1 - crypto - vg/lv

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Message-ID: <20100805190138.GV29846@think>
Date:	Thu, 5 Aug 2010 15:01:38 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Dominik Brodowski <linux@...inikbrodowski.net>,
	Valdis.Kletnieks@...edu, josef@...hat.com,
	Michael Monnerie <michael.monnerie@...it-management.at>,
	Christoph Hellwig <hch@...radead.org>,
	linux-raid@...r.kernel.org, xfs@....sgi.com,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com
Subject: Re: direct-io regression [Was: How to track down abysmal
 performance ata - raid1 - crypto - vg/lv - xfs]

On Thu, Aug 05, 2010 at 02:58:37PM -0400, Jeff Moyer wrote:
> Chris Mason <chris.mason@...cle.com> writes:
> 
> > But, I'm surprised your drive is doing 8K dio reads at 16MB/s, that
> > seems a little high.  
> 
> I'm not sure why you think that.  We're talking about a plain old SATA
> disk, right?  I can get 40-50MB/s on my systems for 8KB O_DIRECT reads.
> What am I missing?

Clearly I'm wrong, his drive is going much faster ;)  I expect the
smaller reads to be slower but the drive's internal cache is doing well.

-chris

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