From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vladislav Bolkhovitin Subject: Re: [Stgt-devel] Re: [Iscsitarget-devel] stgt a new version of iscsi target? Date: Thu, 22 Dec 2005 13:38:46 +0300 Message-ID: <43AA8236.0@vlnb.net> References: <43987F75.2000301@vlnb.net> <4398850D.8070102@cs.wisc.edu> <1134071290.3259.31.camel@mulgrave> <20051222085316J.fujita.tomonori@lab.ntt.co.jp> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from relay03.infobox.ru ([195.208.235.28]:63377 "EHLO relay03.infobox.ru") by vger.kernel.org with ESMTP id S1750861AbVLVKjH (ORCPT ); Thu, 22 Dec 2005 05:39:07 -0500 In-Reply-To: <20051222085316J.fujita.tomonori@lab.ntt.co.jp> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: FUJITA Tomonori Cc: James.Bottomley@SteelEye.com, michaelc@cs.wisc.edu, iscsitarget-devel@lists.sourceforge.net, mingz@ele.uri.edu, stgt-devel@lists.berlios.de, WRWHITEHEAD@novell.com, scst-devel@lists.sourceforge.net, linux-scsi@vger.kernel.org, hch@infradead.org FUJITA, It would be helpful if you also gather CPU utilization statistics during the tests (user/kernel/idle/iowait time + context switches/sec rate). Vlad FUJITA Tomonori wrote: > I did some initial performance tests with both tgt versions and IET > (as you know, another iSCSI software implementation runs in kernel > space). All implementations run with write back policy so probably, > there should be little real disk I/O effect. I started disktest > benchmark software with cold cache state. The machine has 4 GB memory, > 1.5K SCSI disk, 4 CPUs (x86_64). > > (disktest -PT -T10 -h1 -K8 -B8192 -ID /dev/sdc -w) > > o IET > | 2005/12/21-18:05:15 | STAT | 7259 | v1.2.8 | /dev/sdc | Total write throughput: 48195993.6B/s (45.96MB/s), IOPS 5883.3/s. > > o tgt (I/O in kernel space) > | 2005/12/21-18:03:23 | STAT | 7013 | v1.2.8 | /dev/sdc | Total write throughput: 45829324.8B/s (43.71MB/s), IOPS 5594.4/s. > > o mmap tgt > | 2005/12/21-18:22:28 | STAT | 7990 | v1.2.8 | /dev/sdc | Total write throughput: 25373900.8B/s (24.20MB/s), IOPS 3097.4/s.