Re: FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued Discussion

From: Arne (arne_woerner_at_yahoo.com)
Date: 02/03/05

  • Next message: Nick Pavlica: "My disk I/O testing methods for FreeBSD 5.3 ..." 
    Date: Thu, 3 Feb 2005 10:09:38 -0800 (PST)
To: Robert Watson <rwatson@FreeBSD.org>

    --- Robert Watson <rwatson@FreeBSD.org> wrote:
    > On Thu, 3 Feb 2005, Arne WXrner wrote:
    > > I just tested R5.1 with a
    > > time -c "dd if=/dev/zero of=a bs=64k count=1000 ; fsync a"
    > > and it was 4 or about 4 times fast than with R5.3.
    > >
    > > Is it smart to start looking for regressive changes in
    > > sys/dev/ata or in /sys/kern?
    > >
    > > I mean: Did somebody see this phaenomenon on a SCSI disc, too?
    >
    > I'd start by checking to see if the driver/hardware have
    > negotiated the same ATA DMA paramaters or not.
    > Specifically, what UDMA level (etc) was negotiated).
    >
    Hmm. I just know, how to find out the UDMA level:
    They are for both devices at that ATA channel: UDMA100
    ad0: 38166MB <ST340015A> [77545/16/63] at ata0-master UDMA100
    ad1: 152627MB <SAMSUNG SP1604N> [310101/16/63] at ata0-slave
    UDMA100

    R5.3 behaves not worse, when I drop ad0 to UDMA66 with atacontrol.

    -Arne

                    
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