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

From: Robert Watson (rwatson_at_FreeBSD.org)
Date: 02/03/05

  • Next message: Arne : "Re: FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued Discussion" 
    Date: Thu, 3 Feb 2005 16:50:41 +0000 (GMT)
To: Arne WXrner <arne_woerner@yahoo.com>

    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).

    Robert N M Watson

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