From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15688] mptsas & poor performance
Date: Sat, 10 Apr 2010 16:58:43 GMT
Message-ID: <201004101658.o3AGwhrZ015188@demeter.kernel.org>
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https://bugzilla.kernel.org/show_bug.cgi?id=15688
--- Comment #6 from Brian Sullivan 2010-04-10 16:57:26 ---
BTW, I did not look into this as much, but using 3.xx there also seemed to
be a limit of ~600MB/sec between controller & expander. If I put two arrays
on the expander, each array by itself would do almost 500MB/sec in reads,
but together they couldn't break 600MB/sec. I didn't really look into this
further, maybe I was doing something wrong. ~600MB/sec, however, seems like
exactly 1/2 the bandwidth of the minisas cable between controlller &
expander.
On Sat, Apr 10, 2010 at 5:00 AM, wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=15688
>
>
>
>
>
> --- Comment #5 from dujun@perabytes.com 2010-04-10 12:00:53 ---
> Hi Andrew & Kashyap,
>
> It seems to me that the 4.22.00.00 driver from lsi is much faster than
> kernel
> 3.xx version driver. We have 16 WD SATA disks connected through lsi sas
> expander to 1068e hba and linux md raid5 using these disks. The system has
> only
> one quad-core E5405 CPU. With the new lsi driver, we get sequential dd
> read
> performance up to 795MB/s and write performance up to 395MB/s which is
> almost
> twice as the kernel 3.xx driver.
>
> We will investigate different hardware setup further and let u know as soon
> as
> possible.
>
> Johnson
>
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