Messages in this thread | | | Date | Thu, 15 Apr 2004 16:52:04 +0200 | From | "Prakash K. Cheemplavam" <> | Subject | Re: poor sata performance on 2.6 |
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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
[snip]
> So first time it gave the same loosy 27 MB/s and subsequent tests give pretty > good 68 MB/s! Why?
I once reported that to lkml but got no reaction. siimage.c doesn't show this behaviour.
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