Spam: Re: Random file I/O regressions in 2.6 [patch+results]

From: Andrew Morton (akpm_at_osdl.org)
Date: 05/21/04

  • Next message: Pavel Machek: "Re: swsusp also stores system clock" 
    Date:	Fri, 21 May 2004 01:56:47 -0700
To: Jens Axboe <axboe@suse.de>

    Jens Axboe <axboe@suse.de> wrote:
    >
    > I think that's pretty similar. Andrew didn't say what device he was
    > testing on, but 2.4 ide defaults to max 64k where 2.6 defaults to 128k.

    IDE.

    I was being silly, sorry. Those I/O stats include the (huge linear)
    initial write of the "database" files, so the larger IDE request size will
    be dominating.

    What I need is a way of getting sysbench to create and remove the database
    files in separate invokations, but the syntax for that is defeating me at
    present.

    > > I'll take a guess at b, and say it could be as-iosched.c.
    > > Another thing might be that 2.6 has smaller nr_requests than
    > > 2.4, although you are unlikely to hid the read side limit
    > > with only 16 threads if they are doing sync IO.
    >
    > Andrew, you did numbers for deadline previously as well, but no rq
    > statistics there? As for nr_requests that's true, would be worth a shot
    > to bump available requests in 2.6.

    Doubling the request queue size makes no difference.
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