From: Robert Hancock <hancockr@shaw.ca>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Jan Engelhardt" <jengelh@medozas.de>,
"Martin MOKREJŠ" <mmokrejs@ribosome.natur.cuni.cz>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.23.17 & 2.6.24.5 and maybe earlier: pata_marvell: need to disable DMA to get rid of '(ATA bus error)', 'ata7.00: status: { DRDY ERR }', 'ata7.00: error: { ICRC ABRT }'
Date: Fri, 02 May 2008 20:42:53 -0600 [thread overview]
Message-ID: <481BD12D.1030406@shaw.ca> (raw)
In-Reply-To: <fa.qfeYSQtlsXzGvFvBQEdF9TFFpNg@ifi.uio.no>
Alan Cox wrote:
>>> libata.dma=3 will stop DMA being used for CF devices (except those that
>>> decide to pretend to be ATA classes). This one comes up a lot as many CF
>>> adapters are simply not adequate for UDMA.
>> Perhaps the kernel could do this automatically once it sees the
>> status code?
>
> We then hurt all the people with perfectly good working UDMA CF devices.
> The kernel will eventually fall back from UDMA to PIO but it favours
> working hardware by default.
I suspect they meant fall back on seeing the ABRT/ICRC error combination
- which it does, eventually. Falling back on one occurrence would be too
aggressive, though, as they can happen once in a blue moon, so there's
little reason to slow down a working setup forever because of it..
next parent reply other threads:[~2008-05-03 2:43 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.+9Q+WQnyiYTlpbXVIzn6aT2/gS0@ifi.uio.no>
[not found] ` <fa.fKUfeQYS9BFD60fOMormQ25ard4@ifi.uio.no>
[not found] ` <fa.QYXSW2xjSxf6xnmd0rQGJhHLnrc@ifi.uio.no>
[not found] ` <fa.qfeYSQtlsXzGvFvBQEdF9TFFpNg@ifi.uio.no>
2008-05-03 2:42 ` Robert Hancock [this message]
2008-05-06 12:44 ` 2.6.23.17 & 2.6.24.5 and maybe earlier: pata_marvell: need to disable DMA to get rid of '(ATA bus error)', 'ata7.00: status: { DRDY ERR }', 'ata7.00: error: { ICRC ABRT }' Martin MOKREJŠ
2008-05-06 13:08 ` Alan Cox
2008-05-06 14:54 ` Martin MOKREJŠ
2008-05-06 15:04 ` Alan Cox
2008-05-06 16:24 ` Martin MOKREJŠ
2008-05-06 19:04 ` Alan Cox
2008-05-06 23:42 ` Martin MOKREJŠ
2008-05-07 7:25 ` Alan Cox
2008-05-01 17:28 Martin MOKREJŠ
2008-05-01 19:08 ` Alan Cox
2008-05-01 21:24 ` Martin MOKREJŠ
2008-05-01 23:51 ` Jan Engelhardt
2008-05-02 9:57 ` Alan Cox
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