Re: Silicon Image 3112A SATA trouble

From: Jens Axboe (axboe_at_suse.de)
Date: 11/30/03

  • Next message: Jeff Garzik: "Re: Silicon Image 3112A SATA trouble" 
    Date:	Sun, 30 Nov 2003 17:25:23 +0100
To: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>

    On Sun, Nov 30 2003, Bartlomiej Zolnierkiewicz wrote:
    >
    > I read it _very_ closely, here is your original mail with subject
    > "Re: 2.6.0-test9 /-mm3 SATA siimage - bad disk performance":
    >
    > On Saturday 15 of November 2003 10:11, Prakash K. Cheemplavam wrote:
    > > Marcus Hartig wrote:
    > > > Hello all,
    > > >
    > > > with the Fedora 1 kernel 2.4.22-1.2115.nptl I get with hdparm -t
    > > > (Timing buffered disk reads) 34 MB/sec. Its very slow for this drive.
    > > >
    > > > With 2.6.0-test9 and -mm3 I get around "62 MB in 3.05 = 20,31". Wow"
    > > > Back to ~1998?
    > >
    > > I have a similar problem: With 2.4.22-ac3 I had 37mb/sec with my Samsung
    > > HD and 49MB/sec with IBM/Hitachi, now with 2.6 (all I tried, including
    > ^^^^^^^^^^^^
    > > test9-mm2) I had only 20mb/sec for Samsung and about 39mb/sec for the
    > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    > > IBM. Motherboard is Abit NF7-S Rev2.0, as well, so same situation with
    > ^^^^
    > > the siimage 1.06 driver. I wanted to run some dd tests as well, but it
    > > is a real performance hit. Playing with readahead or other hdparm
    > > options didn't help either.
    > >
    > > Prakash
    >
    > In 2.6.x there is no max_kb_per_request setting in /proc/ide/hdx/settings.
    > Therefore
    > echo "max_kb_per_request:128" > /proc/ide/hde/settings
    > does not work.
    >
    > Hmm. actually I was under influence that we have generic ioctls in 2.6.x,
    > but I can find only BLKSECTGET, BLKSECTSET was somehow lost. Jens?

    Probably because it's very dangerous to expose, echo something too big
    and watch your data disappear. 

    -- 
Jens Axboe
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  • Next message: Jeff Garzik: "Re: Silicon Image 3112A SATA trouble"

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