Messages in this thread | | | From | Denis Vlasenko <> | Subject | Re: poor sata performance on 2.6 | Date | Thu, 15 Apr 2004 20:30:50 +0300 |
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On Thursday 15 April 2004 17:48, Konstantin Sobolev wrote: > On Thursday 15 April 2004 18:33, Justin Cormack wrote: > > On Thu, 2004-04-15 at 15:26, Konstantin Sobolev wrote: > > > On Thursday 15 April 2004 18:00, Justin Cormack wrote: > > > > hmm, odd. I get 50MB/s or so from normal (7200, 8MB cache) WD disks, > > > > and Seagate from the same controller. Can you send lspci, > > > > /proc/interrupts and dmesg... > > > > > > Attached are files for 2.6.5-mm5 with highmem, ACPI and APIC turned > > > off. > > > > ah. Make a filesystem on it and mount it and try again. I see you have > > no partition table and so probably no filesystem. This means the block > > size is set to default 512byte not 4k which makes disk operations slow. > > Any filesystem should default to block size of 4k, eg ext2. > > Very interesting! > created partition table, > kos sata # mkfs.ext2 /dev/sda1 > [..skipped..] > kos mnt # cd / > kos / # mkdir wd > kos / # mount /dev/sda1 /wd > kos / # hdparm -t -a8192 /dev/sda > > /dev/sda: > setting fs readahead to 8192 > readahead = 8192 (on) > Timing buffered disk reads: 82 MB in 3.03 seconds = 27.02 MB/sec > > kos / # mount | grep sda > /dev/sda1 on /wd type ext2 (rw) > kos / # hdparm -t -a8192 /dev/sda > > /dev/sda: > setting fs readahead to 8192 > readahead = 8192 (on) > Timing buffered disk reads: 206 MB in 3.02 seconds = 68.15 MB/sec > kos / # hdparm -t -a8192 /dev/sda > > /dev/sda: > setting fs readahead to 8192 > readahead = 8192 (on) > Timing buffered disk reads: 206 MB in 3.02 seconds = 68.18 MB/sec > > So first time it gave the same loosy 27 MB/s and subsequent tests give > pretty good 68 MB/s! Why?
Time to CC ide/libata/block layer folks
Jeff Garzik <jgarzik@pobox.com> libata man
IDE DRIVER [GENERAL] P: Bartlomiej Zolnierkiewicz M: B.Zolnierkiewicz@elka.pw.edu.pl L: linux-kernel@vger.kernel.org L: linux-ide@vger.kernel.org S: Maintained
BLOCK LAYER P: Jens Axboe M: axboe@suse.de L: linux-kernel@vger.kernel.org S: Maintained
SIS 5513 IDE CONTROLLER DRIVER P: Lionel Bouton M: Lionel.Bouton@inet6.fr W: http://inet6.dyn.dhs.org/sponsoring/sis5513/index.html W: http://gyver.homeip.net/sis5513/index.html S: Maintained
-- vda
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