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Date: Thu, 28 Dec 2006 11:24:49 +0900 From: Tejun Heo <htejun@...il.com> To: Rene Herman <rene.herman@...il.com> CC: Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org Subject: Re: PATA -- pata_amd on 2.6.19 fails to IDENTIFY my DVD-ROM Rene Herman wrote: > Tejun Heo wrote: > >> Rene Herman wrote: > >>> I just tried the PATA driver for my AMD756 chip. During boot, it hangs >>> for 3 minutes failing to identify my DVD-ROM (secondary slave) and does >>> not give me access to it after it timed out. >> >> Please give a shot at v2.6.20-rc2 and report what the kernel says. > > This IDENTIFY issue seems already fixed in -rc2. No more pause, and my > DVD-ROM works fine again. Great. > Unfortunately, another issue seems to have > cropped up. On 2.6.20-rc2, hdparm -t /dev/sda gets me ~ 24 M/s while > both the old IDE driver and the 2.6.19 PATA driver do ~ 50 M/s > > 2.6.20-rc2-ata: > > # hdparm -t /dev/sda > > /dev/sda: > Timing buffered disk reads: 72 MB in 3.03 seconds = 23.75 MB/sec > > 2.6.19-ata: > > # hdparm -t /dev/sda > > /dev/sda: > Timing buffered disk reads: 150 MB in 3.00 seconds = 49.94 MB/sec Everything seems fine in the dmesg. Performance degradation is probably some other issue in -rc kernel. I'm suspecting recently fixed block layer bug. If it's still the same in the next -rc, please report. Thanks. -- tejun - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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