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Date:      Thu, 22 Nov 2007 08:33:46 +0000 (GMT)
From:      Robert Watson <rwatson@FreeBSD.org>
To:        =?windows-1252?Q?S=F8ren_Schmidt?= <sos@deepcore.dk>
Cc:        Maxim Sobolev <sobomax@FreeBSD.ORG>, cvs-src@FreeBSD.ORG, src-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, =?windows-1252?Q?S=3Fren_Schmidt?= <sos@FreeBSD.ORG>
Subject:   Re: cvs commit: src/sys/dev/ata ata-all.h ata-chipset.c ata-dma.c  ata-pci.c ata-pci.h atapi-cd.c atapi-fd.c atapi-tape.c
Message-ID:  <20071122082847.N60495@fledge.watson.org>
In-Reply-To: <474533A4.3030106@deepcore.dk>
References:  <200711212115.lALLF16n017990@repoman.freebsd.org> <4744DE58.9090005@FreeBSD.org> <4744EF09.4060009@FreeBSD.org> <474533A4.3030106@deepcore.dk>

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On Thu, 22 Nov 2007, S=F8ren Schmidt wrote:

>>>>   FreeBSD src repository
>>>>
>>>>   Modified files:  (Branch: RELENG_7)
>>>>     sys/dev/ata ata-all.h ata-chipset.c ata-dma.c ata-pci.c ata-pci.h=
=20
>>>> atapi-cd.c atapi-fd.c atapi-tape.c Log:
>>>>   Update with the latest fixes from -current.
>>>=20
>>> Please don't forget to merge at least atapi-cd.c fix into RELENG_6.=20
>>> Currently CD is not working in Parallels with 6.3-PRERELEASE.
>>=20
>> Also, I see some "ad0: TIMEOUT - WRITE_DMA (retrying)" messages with=20
>> Parallels using latest 6.3-PRERELEASE snapshot. Not sure if it's due to=
=20
>> some changes between 6.2 and 6.3, but I've never seen this with 6.2. Any=
=20
>> ideas?
>
> I have a complete backport of all the latest fixes done for 6.3 awaiting=
=20
> approval.
>
> I've seen such a timeout once on 6.3 before I merged the latest changes,=
=20
> since then I've not seen any, not that it means much though :)

I see them any time I do anything involving significant disk load under=20
Parallels--I've always assumed it was because there are several layers of=
=20
indirection, including HFS+ and an expanding Parallels disk image, beween t=
he=20
FreeBSD ATA driver and hardware, leading to significantly longer delays tha=
n=20
the ATA driver would expect from normal hardware.  That said, I'm fine with=
=20
being wrong and seeing a bug fixed :-).  I usually get several each time I=
=20
buildkernel, such as last night:

ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=3D5208191
ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=3D23670111
ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=3D5843715
ad0: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=3D40407615

Robert N M Watson
Computer Laboratory
University of Cambridge
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