Date: Thu, 09 Sep 2004 22:37:31 +0200 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> To: Kevin Oberman <oberman@es.net> Cc: Bjoern Koenig <bkoenig@cs.tu-berlin.de> Subject: Re: poor ATA disk speed with ICH2 Message-ID: <4140BF0B.6090308@DeepCore.dk> In-Reply-To: <20040909202807.1F5295D09@ptavv.es.net> References: <20040909202807.1F5295D09@ptavv.es.net>
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Kevin Oberman wrote: > Here are the results of my last test back in May plus tests done on a > kernel built from sources downloaded on Sep. 6. Is that going to catch > your fix? I don't see much difference. Do you have version number I can= > check? Sep 6 should be fine if we are talking -current, on RELENG_5 it=20 "depends" since the MFC was done on the 6'th.. >=20 > Buffer V4 Read V4 Write V5 Read V5 Write =20 > 512 8385790 8111781 6921714 5115853 7130873 5261294 > 1k 15457027 14865113 12330562 7811422 12494677 7952281 > 2k 25677856 25273251 19939822 10572186 20137339 10708676 > 4k 27083255 25897711 27096896 12860586 27064850 12982472 > 8k 27079563 26033768 27097726 14416520 27017494 14497783 > 16k 27082575 Oops! 27082273 15316924 26936316 15374888 > 32k 27080720 25908336 27100118 15816203 26977041 15853140 > 64k 27079904 26008387 27096093 16073422 26939153 15938326 > 128k 27055901 25928520 27095673 16073422 > 256k 27076467 25918950 27090967 16118789 > 512k 27045087 25987266 27077925 16006708 > 1m 27026694 25738575 27060626 15879266 >=20 > Read: dd if=3D/dev/ad2 of=3D/dev/null bs=3Dnnn > Write:dd if=3D/dev/zero of=3D/dev/ad2 bs=3Dnnn > All tests run for about 30 seconds. > All tests in single-user mode. Nothing on ad2 is mounted. > Debug (WITNESS, INVARIANTS, malloc checking) disabled. > While the test is running, the disk being written to "sings" with the > frequency somewhat dependent on the size of the write. On read, I get > silence. When I copy my full disk (if=3Dad0 of=3Dad2), I can clearly he= ar > the sound of the actuator moving the heads constantly toward the end of= > the backup. I assume that they are being returned to track 0 on a > repeated basis. There should be no seeks on a lone write to the raw disk, if there is=20 you have HW problems as the driver doesn't issue any seeks at all then. What disks are this BTW ? -S=F8ren
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