Date: Thu, 3 Feb 2005 16:50:41 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Arne WXrner <arne_woerner@yahoo.com> Cc: freebsd-performance@freebsd.org Subject: Re: FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued Discussion Message-ID: <Pine.NEB.3.96L.1050203164817.6650A-100000@fledge.watson.org> In-Reply-To: <20050203164210.96116.qmail@web41205.mail.yahoo.com>
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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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