https://bugzilla.kernel.org/show_bug.cgi?id=15688 --- Comment #2 from kdesai <kashyap.desai@xxxxxxx> 2010-04-08 10:31:17 --- Andrew, Today I tried same steps as mentioned by you. In my case I am able to see both the drivers Performance is similar. 3.4.14 is driver version available at kernel.org 4.22.00.00 is driver LSI internally uses. [4.18.00.00 does not have support for 2.6.34 kernel] I guess you must have done some changes to make sure 4.18.00.00 works with 2.6.34-020634rc1. Both the case I am getting 190~210MB/sec. Can you help me to reproduce ~395MB/sec using 4.18.00.00 ? ~Kashyap > -----Original Message----- > From: linux-scsi-owner@xxxxxxxxxxxxxxx [mailto:linux-scsi- > owner@xxxxxxxxxxxxxxx] On Behalf Of Andrew Morton > Sent: Tuesday, April 06, 2010 2:05 AM > To: linux-scsi@xxxxxxxxxxxxxxx; Moore, Eric > Cc: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx; bugme- > daemon@xxxxxxxxxxxxxxxxxxx; bexamous@xxxxxxxxx > Subject: Re: [Bugme-new] [Bug 15688] New: mptsas & poor performance > > > (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@xxxxxxxxxxxxxxxxxxx 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@xxxxxxxxxxxxxxxxxxxx > > ReportedBy: bexamous@xxxxxxxxx > > 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. > > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" > in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
