Date: Tue, 3 Apr 2001 18:52:29 -0500 From: "Corey G." <ctgaff@telocity.com> To: freebsd-stable@freebsd.org Subject: Re: UDMA 33/UDMA 100 perfs Message-ID: <20010403185228.B82131@telocity.com> In-Reply-To: <200103130329.f2D3TXN73556@freefall.freebsd.org>; from jmz@FreeBSD.ORG on Mon, Mar 12, 2001 at 07:29:33PM -0800 References: <200103130329.f2D3TXN73556@freefall.freebsd.org>
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Since I have seen some discussions here on IO tests with various disk vendors I want to point out something about the Maxtor drives. Most people already know this but some may not. For all the new Maxtor ATA100 drives there are some things that can really hurt you if you do not pay attention while performing IO tests. 1. They ship with an extra write verify enabled for the first 10 power cycles. This can be turned off with the Maxtor write verification utility. This will obviously hurt any performance tests. 2. By default the ATA100 drives are shipped with a maximum UDMA of 66. Only by using the UDMA update software can you invoke UDMA/100. 3. Acoustic dampening is on by default. This is used to make the drive run more quietly. However, it comes with a performance hit. You must use the acoustic management utility to turn this option off for the best performance. I have successfully done the steps above on 4.3RC1 without any problems with softupdates enabled as well. I am using the maxtor PCI ATA/100 controller card. All of these utilities can be found at Maxtor's homepage. Thanks, Corey On Mon, Mar 12, 2001 at 07:29:33PM -0800, Jean-Marc Zucconi wrote: > Is this the normal behavior expected? > > 1) > ata0-master: DMA limited to UDMA33, non-ATA66 compliant cable > ad0: 19092MB <WDC WD200EB-00BHF0> [38792/16/63] at ata0-master using UDMA33 > # dd if=/dev/ad0e of=/dev/null bs=1m count=1000 > 1048576000 bytes transferred in 49.445390 secs (21206750 bytes/sec) > > 2) > ad0: 19092MB <WDC WD200EB-00BHF0> [38792/16/63] at ata0-master UDMA100 > # dd if=/dev/ad0e of=/dev/null bs=1m count=1000 > 1048576000 bytes transferred in 49.337278 secs (21253220 bytes/sec) > > I get the same performance in both cases. This is with a 4.3-BETA > kernel. I have only one drive on the IDE bus. > > Jean-Marc > > -- > Jean-Marc Zucconi -- PGP Key: finger jmz@FreeBSD.org [KeyID: 400B38E9] > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message ---end quoted text--- -- Best Regards, Corey To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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