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Date: Sat, 13 Nov 2004 11:29:19 +0100
From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk>
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To: Poul-Henning Kamp <phk@phk.freebsd.dk>
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cc: Robert Watson <rwatson@freebsd.org>
Subject: Re: 5.3-RELEASE: WARNING - WRITE_DMA interrupt timout
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Poul-Henning Kamp wrote:
> In message <4195DB3E.2040807@DeepCore.dk>, =3D?ISO-8859-1?Q?S=3DF8ren_S=
chmidt?=3D wri
> tes:
>=20
>=20
>>>It is not really the task of the ata driver to fail requests at that
>>>time.   How long is the timeout anyway ?
>>
>>Oh, ATA doesn't fail them, it just yells that the request hasn't been=20
>>finished yet by the upper layers, it doesn't do anything to the request=
=2E
>>
>>Timeout is 5 secs, which is a pretty long time in this context IMHO..
>=20
> Five seconds counted from when ?

Now thats the nasty part :)
ATA starts the timeout when the request is issued to the device, so=20
theoretically the disk could take 4.9999 secs to complete the request=20
and then the timeout fires before the taskqueue gets its chance at it,=20
but IMHO thats pretty unlikely...

Anyhow, I can just remove the warning from ATA if that makes anyone=20
happy, since its just a warning and ATA doesn't do anything with it at al=
l.
However, IMNHO this points at a problem somewhere that we should better=20
understand and fix instead.

--=20

-S=F8ren