Date: 07 Feb 2003 14:15:43 +1030 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: Dong Lin <dong@plan9.bell-labs.com> Cc: current@FreeBSD.ORG Subject: Re: ATA code is buggy and slower Message-ID: <1044589542.7212.5.camel@chowder.gsoft.com.au> In-Reply-To: <3E43248F.2030303@plan9.bell-labs.com> References: <3E43248F.2030303@plan9.bell-labs.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, 2003-02-07 at 13:44, 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 You might get more help if you sent a more complete problem description.. eg dmesg output for a start. I'm pretty sure the 5.x code is almost identical to the 4.x stuff bar extra locking calls. My Quantum fireball drive gets 35Mb/sec under both 4.5 and 4.7.. I have a WD800BB on a 4.7 box and it does 48.7 Mb/sec. -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 9A8C 569F 685A D928 5140 AE4B 319B 41F4 5D17 FDD5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1044589542.7212.5.camel>