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Open Source and information security mailing list archives
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Date: Wed, 07 Feb 2007 22:36:58 -0600 From: Robert Hancock <hancockr@...w.ca> To: Alan <alan@...rguk.ukuu.org.uk>, linux-kernel <linux-kernel@...r.kernel.org> Cc: Luigi Genoni <genoni@....it> Subject: Re: [BUG?] ata disk running maximum at DMA33 with 2.6.20 and new pata driver, NV CK804 ide controller. Alan wrote: > On Wed, 7 Feb 2007 01:19:36 +0100 > Luigi Genoni <genoni@....it> wrote: > >> Hi, >> since upgrading to kernel 2.6.20 my pata disk, using new pata driver, is >> initialized maximum in DMA33 mode (and obviously performances drop >> consequently), as you can see from: > > Interesting. > >> Willing to test any patch. > > Firstly can you see if its consistently the case that booting 2.6.20 > gives UDMA33 and 2.6.19 UDMA100 over a few reboots. If it is please drop > the 2.6.19 drivers/ata/pamd_amd into 2.6.20 and try that. As an aside to this sort of problem, shouldn't we print some kind of loud message in dmesg when we force a high-UDMA-capable device down to UDMA33 due to a 40-wire cable detection? In the case where it truly is a 40-wire cable the user may want to know that and replace the cable, if it isn't it gives more of a hint of why the drive isn't running at full speed.. -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@...pamshaw.ca Home Page: http://www.roberthancock.com/ - 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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