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Date: Sat, 12 Aug 2006 17:45:49 -0700
From: Andrew Morton <akpm@osdl.org>
To: David Miller <davem@davemloft.net>
Cc: axboe@suse.de, linux-kernel@vger.kernel.org
Subject: Re: softirq considered harmful
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On Sat, 12 Aug 2006 17:43:24 -0700 (PDT)
David Miller <davem@davemloft.net> wrote:

> From: Andrew Morton <akpm@osdl.org>
> Date: Sat, 12 Aug 2006 16:28:57 -0700
> 
> > Maybe I missed the discussion.  But if not, this is yet another case of
> > significant changes getting into mainline via a git merge and sneaking
> > under everyone's radar.
> 
> Scsi has been doing command completions via a per-cpu softirq handler
> for as long as we've had an SMP more advanced than lock_kernel() :-)

Is that also adding 150 usecs to each IO operation?