[Bug 15688] New: mptsas & poor performance - bugzilla-daemon

From: bugzilla-daemon@bugzilla.kernel.org
To: linux-scsi@vger.kernel.org
Subject: [Bug 15688] New: mptsas & poor performance
Date: Mon, 5 Apr 2010 20:35:37 GMT	[thread overview]
Message-ID: <bug-15688-11613@https.bugzilla.kernel.org/> (raw)

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

           Summary: mptsas & poor performance
           Product: SCSI Drivers
           Version: 2.5
    Kernel Version: 2.6.34-020634rc1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        AssignedTo: scsi_drivers-other@kernel-bugs.osdl.org
        ReportedBy: bexamous@gmail.com
        Regression: No

The mptsas module from LSI's website, v4.18.00.00, performs much better than
the mptsas module included in the kernel, v3.something.

I'm only comparing sequential writes (dd if=/dev/zero of=zeros bs=1M), but...

6 drive MD RAID5 with fresh btrfs, writing 10GB of zeros with dd,
kernel version:  <200MB/sec
LSI's v4.18.00.00: 395MB/sec

Pretty big difference.  I've gone back and forth a few times,
enabling/disabling write cache on the drives, enabling/disabling ioc,
enabling/disabling filesystem barriers...  I can make small changes in
performance but nothing compares to simply updating to v4.18.00.00.

--- Comment #1 from Andrew Morton <akpm@linux-foundation.org>  2010-04-05 20:35:32 ---
(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

scsi_drivers-other reports don't appear to be coming out on the
linux-scsi list.

On Sat, 3 Apr 2010 21:16:31 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=15688
> 
>            Summary: mptsas & poor performance
>            Product: SCSI Drivers
>            Version: 2.5
>     Kernel Version: 2.6.34-020634rc1
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Other
>         AssignedTo: scsi_drivers-other@kernel-bugs.osdl.org
>         ReportedBy: bexamous@gmail.com
>         Regression: No
> 
> 
> The mptsas module from LSI's website, v4.18.00.00, performs much better than
> the mptsas module included in the kernel, v3.something.
> 
> I'm only comparing sequential writes (dd if=/dev/zero of=zeros bs=1M), but...
> 
> 6 drive MD RAID5 with fresh btrfs, writing 10GB of zeros with dd,
> kernel version:  <200MB/sec
> LSI's v4.18.00.00: 395MB/sec
> 
> Pretty big difference.  I've gone back and forth a few times,
> enabling/disabling write cache on the drives, enabling/disabling ioc,
> enabling/disabling filesystem barriers...  I can make small changes in
> performance but nothing compares to simply updating to v4.18.00.00.
>

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