Re: poor sata performance on 2.6

From: Prakash K. Cheemplavam (PrakashKC_at_gmx.de)
Date: 04/15/04

  • Next message: Chris Friesen: "Re: modules in 2.6 kernel - question for FAQ?" 
    Date:	Thu, 15 Apr 2004 16:52:04 +0200
To: Konstantin Sobolev <kos@supportwizard.com>

    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.

    Prakash
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  • Next message: Chris Friesen: "Re: modules in 2.6 kernel - question for FAQ?"

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