Messages in this thread | | | Date | Sun, 29 Jan 2012 13:59:17 +0800 | From | Wu Fengguang <> | Subject | Re: Bad SSD performance with recent kernels |
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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.
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