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Date: Sun, 29 Jan 2012 13:59:17 +0800 From: Wu Fengguang <wfg@...ux.intel.com> To: Eric Dumazet <eric.dumazet@...il.com> Cc: Herbert Poetzl <herbert@...hfloor.at>, Andrew Morton <akpm@...ux-foundation.org>, LKML <linux-kernel@...r.kernel.org>, Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org> Subject: Re: 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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