Date: Fri, 7 Feb 2003 08:20:09 +0100 (CET) From: Soeren Schmidt <sos@spider.deepcore.dk> To: Dong Lin <dong@plan9.bell-labs.com> Cc: current@FreeBSD.ORG Subject: Re: ATA code is buggy and slower Message-ID: <200302070720.h177K9dG030735@spider.deepcore.dk> In-Reply-To: <3E43248F.2030303@plan9.bell-labs.com>
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It seems Dong Lin wrote: > > My 5.0R kernel complains about "READ timeout" and "resetting" when I try > to dd the disk. But everything *works* if I boot the same equipment with > 4.5R and 4.7R. It seems that the error can occur on any sector I pick as > long as I keep reading it inside a loop, a sign of timing problems. > > The 5.0 ATA code is so different that I am not sure where to start. If > someone can show me a way to run the 4.7 ATA code under 5.0, I am > willing to debug it. > > My equipment: Promise ATA66 controller(0x4d38105a r01), WDC WD400BB > ATA/100, ATA66 cable. > > Also, my simple dd measurements show that performance is going down: > > dd if=/dev/ad4 of=/dev/null bs=8m > 4.5R: 49 MB/s > 4.7R: 39 MB/s > 5.0R: does not finish Grap the ATA driver (sys/dev/ata) from -currrent, there is a bug in the 48bit support code for old promises thats not fixed in 5.0. -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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