[Bug 15688] mptsas & poor performance

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=15688





--- Comment #6 from Brian Sullivan <bexamous@gmail.com>  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, <bugzilla-daemon@bugzilla.kernel.org>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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