Date: Mon, 12 Mar 2001 19:29:33 -0800 (PST) From: Jean-Marc Zucconi <jmz@FreeBSD.org> To: freebsd-stable@FreeBSD.org Subject: UDMA 33/UDMA 100 perfs Message-ID: <200103130329.f2D3TXN73556@freefall.freebsd.org>
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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
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