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Re: [dm-devel] direct-io regression [Was: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs]
- From: Jeff Moyer <jmoyer redhat com>
- To: Chris Mason <chris mason oracle com>
- Cc: Michael Monnerie <michael monnerie is it-management at>, linux-raid vger kernel org, Valdis Kletnieks vt edu, linux-kernel vger kernel org, Dominik Brodowski <linux dominikbrodowski net>, xfs oss sgi com, Christoph Hellwig <hch infradead org>, dm-devel redhat com, josef redhat com
- Subject: Re: [dm-devel] direct-io regression [Was: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs]
- Date: Thu, 05 Aug 2010 14:58:37 -0400
Chris Mason <chris mason oracle 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?
Cheers,
Jeff
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