bad performance on ATA promise controllers

From: José M. Fandiño (freebsd_at_fadesa.es)
Date: 05/26/03

  • Next message: Mike Harding: "Re: system slowdown - vnode related" 
    Date: Mon, 26 May 2003 18:13:49 +0200
To: stable@freebsd.org

    Hello friends,

     I'm having a problem with my home server (ASUS A7V133 motherboard) which has
    a horrible performance with ATA disks connected to an integrated promise
    controller.

    Below you can see iozone results of the same disk connected to the primary/
    secondary controller versus the promise one.

    Promise ATA100 controller:
    =========================
    Version 1.02a ------Sequential Output------ --Sequential Input- --Random-
                        -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
    Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
    damocles 1G 7285 18 7235 3 5198 3 18830 58 19332 7 180.5 0

    VIA 82C686 ATA100 controller:
    ============================
    Version 1.02a ------Sequential Output------ --Sequential Input- --Random-
                        -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
    Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
    damocles 1G 24301 63 25047 11 13182 8 29843 85 30678 12 185.1 1

    There is a big diference, 7MB/s connected in the promise and 24MB/s in the 686
    and using UltraDMA-100 in both cases.
    Transfers between ATA devices are even worse, certain combinations give me
    transfer rates as low as 1MB/s :-?
    I tried with other disks/ata cables and the results where identical.

    If I boot GNU/Linux in the same machine all disks work as expected in
    the promise controller, so this make me think that it's a specific problem
    with FreeBSD.

    Until now, I haven't had any luck searching in the mailing list archives
    about this problem so I'm trying to asking here. Does anyone know where the
    problem could be?

    Thanks

    ** dmesg:
    http://www.fadesa.es/misc/promise.txt 

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  • Next message: Mike Harding: "Re: system slowdown - vnode related"