Messages in this thread | | | Date | Thu, 5 Aug 2010 15:01:38 -0400 | From | Chris Mason <> | Subject | Re: direct-io regression [Was: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs] |
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On Thu, Aug 05, 2010 at 02:58:37PM -0400, Jeff Moyer wrote: > 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?
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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