From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yuri Tikhonov Subject: Re[2]: [PATCH 07/11] md: rewrite handle_stripe_dirtying6 in asynchronous way Date: Fri, 16 Jan 2009 17:46:03 +0300 Message-ID: <1675190812.20090116174603@emcraft.com> References: <200812090057.33890.yur@emcraft.com> <91b13c310901151707x48b1ef8av1609c3a622c19565@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <91b13c310901151707x48b1ef8av1609c3a622c19565@mail.gmail.com> Sender: linux-raid-owner@vger.kernel.org To: Cheng Renquan Cc: Dan Williams , linux-raid@vger.kernel.org, linuxppc-dev@ozlabs.org, dzu@denx.de, wd@denx.de, yanok@emcraft.com List-Id: linux-raid.ids =0D Hello Cheng, On Friday, January 16, 2009 you wrote: > Ack, could you please make the changelog more descriptive? > and or add some of your benchmark results? Of course. We did benchmarking using the Xdd tool like follows: # xdd -op write -kbytes $kbytes -reqsize $reqsize -dio-passes 2 =E2=80=93= verbose -target $target_device where $kbytes =3D data disks * size of disk $reqsize=3D data disks * chunk size $target_device =3D /dev/md0 This way we did write of full array size, and thus achieved the=20 maximum performance. The test cases were RAID-6 built on the top of 14 S-ATA drives=20 connected to 2 LSI cards (7+7) inserted into the 800 MHz Katmai board=20 (based on ppc440spe) equipped with 4GB of 800 MHz DRAM . Here are the results (Psw - write throughput with s/w RAID-6; Phw -=20 write throughput with the h/w accelerated RAID-6): PAGE_SIZE=3D4KB, chunk=3D64/128/256 KB Psw =3D 71/72/74 MBps Phw =3D 128/136/139 MBps PAGE_SIZE=3D16KB, chunk=3D256/512/1024 KB Psw =3D 81/81/82 MBps Phw =3D 205/244/239 MBps PAGE_SIZE=3D64KB, chunk=3D1024/2048/4096 KB Psw =3D 84/84/85 MBps Phw =3D 258/253/258 MBps PAGE_SIZE=3D256KB, chunk=3D4096/8192/16384 KB Psw =3D 81/83/83 MBps Phw =3D 288/275/274 MBps Regards, Yuri -- Yuri Tikhonov, Senior Software Engineer Emcraft Systems, www.emcraft.com -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html