From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Alan D. Brunelle" Subject: Re: Possible performance regression? Date: Tue, 03 Jan 2006 09:37:13 -0500 Message-ID: <43BA8C19.6010706@hp.com> References: <43B94DB9.5040505@hp.com> <43BA5384.5070504@ilsb.tuwien.ac.at> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from atlrel9.hp.com ([156.153.255.214]:12217 "EHLO atlrel9.hp.com") by vger.kernel.org with ESMTP id S1751434AbWACObr (ORCPT ); Tue, 3 Jan 2006 09:31:47 -0500 In-Reply-To: <43BA5384.5070504@ilsb.tuwien.ac.at> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Gerhard Schneider Cc: linux-scsi@vger.kernel.org Gerhard Schneider wrote: >Alan D. Brunelle wrote: > > >>(0,1) 1 2 4 8 16 32 64 128 256 >>RHEL4U2 23.8 46.8 87.8 89.6 89.5 89.6 89.5 89.5 89.5 >>2.6.14 3.9 7.8 15.6 31.2 62.5 89.6 89.5 89.5 89.6 >>Differ -83.6% -83.3% -82.2% -65.2% -30.2% 0.0% 0.0% 0.0% 0.0% >> >>(0,1) means target 1 on bus 0, and then the columns represent different >>transfer sizes (1K up to 256K). I also see some that show little if any >>difference: >> >>(6,4) 1 2 4 8 16 32 64 128 256 >>RHEL4U2 23.9 46.9 88.5 90.0 89.9 89.9 89.9 90.0 89.9 >>2.6.14.2 24.1 47.0 88.5 90.0 89.9 90.0 89.9 89.9 89.9 >>Differ 0.8% 0.2% 0.0% 0.0% 0.0% 0.1% 0.0% -0.1% 0.0% >> >> >> > >Did you apply [PATCH] mptfusion : dv performance fix by >Eric Dean Moore? (Dec. 1st, 2005) W/o that patch the first four disks of >an 1030 are performing 3.5 MB/s instead of 70 :-) >It was funny how slow a RAID 5-0 can be when four of fourteen disks >are slow... > > GS > > > I do not know how to grab that specific patch, but I am just trying a 2.6.15-rc6 kernel, and things seem much better. I'm hoping that 2.6.15-rc6 contains the patch you mention? Thanks, Alan