Date: Thu, 3 Feb 2005 10:09:38 -0800 (PST) From: Arne "Wörner" <arne_woerner@yahoo.com> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-performance@freebsd.org Subject: Re: FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued Discussion Message-ID: <20050203180938.48102.qmail@web41215.mail.yahoo.com> In-Reply-To: <Pine.NEB.3.96L.1050203164817.6650A-100000@fledge.watson.org>
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--- 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 __________________________________ Do you Yahoo!? Meet the all-new My Yahoo! - Try it today! http://my.yahoo.com
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