From: "Jack Wang" <jack_wang@usish.com>
To: 'ersatz splatt' <ersatzsplatt@gmail.com>, lindar_liu@usish.com
Cc: linux-scsi@vger.kernel.org
Subject: Re: pm8001 performance degradation?
Date: Tue, 12 Jul 2011 09:27:13 +0800 [thread overview]
Message-ID: <316E3E573B654596BA694678AE395999@usish.com.cn> (raw)
In-Reply-To: <CAHQAjVFuvh72uJ4x9g-P0XrihfWfUt1YtipTJgd9iXzTS+Vz=w@mail.gmail.com>
> Hello Jack Wang and Lindar Liu,
>
>
> I am running the pm8001 driver (on applicable hardware including a
> several core SMP server).
>
> When I run on an older kernel -- e.g. 2.6.34.7 -- I get about 73Kiops
> via an fio test.
>
> When I run a current kernel -- e.g. 2.6.39.2 -- on the same system and
> same storage I get about 15Kiops running the same fio test.
>
> Perhaps something has changes in the kernel that is not being accounted
for?
> Are you two still maintaining this driver?
>
>
> Regards,
> David
[Jack Wang] Could you give your detailed topology, I will later try to
investigate the performance issue, but as I remember an Intel developer
reports in mailist some changes in block layer lead to JBOD performance
degradation.
next prev parent reply other threads:[~2011-07-12 1:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-11 19:06 pm8001 performance degradation? ersatz splatt
2011-07-12 1:27 ` Jack Wang [this message]
2011-07-12 2:44 ` ersatz splatt
2011-07-12 2:46 ` ersatz splatt
2011-07-12 4:18 ` Jack Wang
2011-07-12 19:34 ` ersatz splatt
2011-07-13 3:15 ` ersatz splatt
2011-07-13 4:08 ` Jack Wang
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