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SubjectRe: Bad SSD performance with recent kernels
On Sat, Jan 28, 2012 at 02:33:31PM +0100, Eric Dumazet wrote:
> Le samedi 28 janvier 2012 à 20:51 +0800, Wu Fengguang a écrit :
>
> > Would you please create a filesystem and large file on sda and run the
> > tests on the file? There was some performance bug on reading the raw
> > /dev/sda device file..
>
> Hmm... latest kernel has the performance bug right now.
>
> Really if /dev/sda is slow, we are stuck.

What's the block size? If it's < 4k, performance might be hurt.

blockdev --getbsz /dev/sda

> FYI, I started a bisection.

Thank you! If the bisection would take much human time, it should be
easier to collect some blktrace data on reading /dev/sda for analyzes.

Thanks,
Fengguang
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