linux-kernel - Re: [dm-crypt] INFO: task mount:11202 blocked for more than 120 seconds

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Message-Id: <200803171936.22260.chunkeey@web.de>
Date:	Mon, 17 Mar 2008 19:36:21 +0100
From:	Chr <chunkeey@....de>
To:	Alasdair G Kergon <agk@...hat.com>
Cc:	Christian Kujau <lists@...dbynature.de>,
	Milan Broz <mbroz@...hat.com>, David Chinner <dgc@....com>,
	LKML <linux-kernel@...r.kernel.org>, xfs@....sgi.com,
	dm-devel@...hat.com, dm-crypt@...ut.de,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Ritesh Raj Sarraf <rrs@...earchut.com>
Subject: Re: [dm-crypt] INFO: task mount:11202 blocked for more than 120 seconds

On Monday 17 March 2008 18:36:09 Alasdair G Kergon wrote:
> Latest version for everyone to try:
>
> From: Milan Broz <mbroz@...hat.com>
>
> Fix regression in dm-crypt introduced in commit
> 3a7f6c990ad04e6f576a159876c602d14d6f7fef
> (dm crypt: use async crypto).
>
> If write requests need to be split into pieces, the code must not
> process them in parallel because the crypto context cannot be shared.
> So there can be parallel crypto operations on one part of the write,
> but only one write bio can be processed at a time.
>
> This is not optimal and the workqueue code need to be optimized for
> parallel processing, but for now it solves problem without affecting
> the performance of synchronous crypto operation (most of current
> dm-crypt users).
>
> Signed-off-by: Milan Broz <mbroz@...hat.com>
> Signed-off-by: Alasdair G Kergon <agk@...hat.com>
Tested-by: Christian Lamparter <chunkeey@....de>

Well, the dm-crypt regressions seems to be gone. :)
Thanks for your work & time!

Regards, 
	Christian
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