Date: Wed, 27 Oct 2004 15:25:31 +0200 From: Willem Jan Withagen <wjw@withagen.nl> To: "Alexander S. Usov" <A.S.Usov@KVI.nl> Cc: current@freebsd.org Subject: Re: 5.3-RC1 poor ATA perfomance Message-ID: <417FA1CB.2000601@withagen.nl> In-Reply-To: <200410271444.04324.A.S.Usov@kvi.nl> References: <200410271444.04324.A.S.Usov@kvi.nl>
next in thread | previous in thread | raw e-mail | index | archive | help
Alexander S. Usov wrote: > Hi! > > I have hit a very strange problem with a poor ata perfomance. > > First some numbers: > === FreeBSD 5.3-RC1 > # dd if=/dev/ad0 of=/dev/null bs=1m count=512 > 536870912 bytes transferred in 23.891834 secs (22470896 bytes/sec) > # dd if=/dev/zero of=/dev/ad0s1 bs=1m count=512 > 536870912 bytes transferred in 35.413467 secs (15160078 bytes/sec) > > === Linux 2.6.8-1 (OpenBSD also gives similar numbers) > # dd if=/dev/hda of=/dev/null bs=1M count=512 > 536870912 bytes transferred in 22.272891 seconds (24104231 bytes/sec) > # dd if=/dev/zero of=/dev/hda1 bs=1M count=512 > 536870912 bytes transferred in 23.574157 seconds (22773706 bytes/sec) > > As you see the writing is quite slower. > > Some details on hardware: > atapci0: <Intel ICH4 UDMA100 controller> port 0x1860-0x186f,0x376, > 0x170-0x177,0x3f6,0x1f0-0x1f7 at device 31.1 on pci0 > ata0: channel #0 on atapci0 > ad0: 38154MB <TOSHIBA MK4021GAS/GA224A> [77520/16/63] at ata0-master UDMA100 > > ad1 is absent. > Arrrggghhhh, please not all over again. We've just sort of terminated the previous thread about this: http://lists.freebsd.org/pipermail/freebsd-current/2004-October/040474.html And it is a LONG thread. One of the more essentail remarks made bij PHK was that this type of testing is close to no use/good. And to be honest: previously discussed number were even worse. And were probably dues to hardware which was designed/backed on monday-morning. First problem is that you need to determine what you want to do with your system. Please read the thread. --WjW
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?417FA1CB.2000601>