linux-kernel - Re: 2.6.24 Kernel Soft Lock Up with heavy I/O in dm-crypt

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Message-ID: <20080229181551.GA28193@gondor.apana.org.au>
Date:	Sat, 1 Mar 2008 02:15:51 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ritesh Raj Sarraf <rrs@...earchut.com>,
	Christophe Saout <christophe@...ut.de>,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com
Subject: Re: 2.6.24 Kernel Soft Lock Up with heavy I/O in dm-crypt

On Thu, Feb 28, 2008 at 11:20:48PM -0800, Andrew Morton wrote:
>
> Now, I'm assuming that it's just unreasonable for a machine to spend a full
> 11 seconds crunching away on crypto in that code path.  Maybe it _is_
> reasonable, and all we need to do is to poke a cond_resched() in there
> somewhere.  Herbert, any thoughts?  What's the speed of that code?

It encryps 512 bytes each time so it should definitely be pretty
quick.  Perhaps the caller is disabling interrupts or something?

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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