linux-kernel - Re: sequential I/O on SSD disk varies from 20 to 300 MBytes/s every week

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Date:	Wed, 4 Feb 2015 11:50:58 +0200 (EET)
From:	Siim Vahtre <siim@...ee>
To:	Purush Gupta <purush.gupta@...anix.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>
Subject: Re: sequential I/O on SSD disk varies from 20 to 300 MBytes/s every
 week

> Since you mentioned problem does not happen on Windows, what do you use 
> to emulate the workload (iometer ?)

CrystalDiskMark, HD Tune, ATTO Disk Benchmark

Tested for 2-3 hours, but got stable results. Directly afterwards booted 
Live CD with Linux and immediately got poor results.


> and did you see the same behaviour with other Kernel versions like 
> 2.6.32.

I did not test this, as this kernel version wouldn't work for me anyway. 
If you think it would be very important datapoint, I can try.


> You may want to check the per device queue configuration, lsscsi -L

"queue_depth=256", same for all disks

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