From: Andrew Morton <akpm@osdl.org>
To: Jens Axboe <axboe@suse.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: softirq considered harmful
Date: Sat, 12 Aug 2006 16:28:57 -0700 [thread overview]
Message-ID: <20060812162857.d85632b9.akpm@osdl.org> (raw)
In-Reply-To: <20060810110627.GM11829@suse.de>
On Thu, 10 Aug 2006 13:06:27 +0200
Jens Axboe <axboe@suse.de> wrote:
> Ok maybe that is a little too strong, but I am indeed seeing some very
> sucky behaviour with softirqs here. The block layer uses it for doing
> request completions
I wasn't even aware that this change had been made. I don't recall (and I
cannot locate) any mailing list discussion of it.
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.
It seems like a bad idea to me. Any additional latency at all in disk
completion adds directly onto process waiting time - we do a _lot_ of
synchronous disk IO.
There is no mention in the changelog of any observed problems which this
patch solves. Can we revert it please?
next prev parent reply other threads:[~2006-08-12 23:29 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-10 11:06 Jens Axboe
2006-08-10 11:41 ` David Miller
2006-08-10 12:26 ` Jens Axboe
2006-08-12 23:28 ` Andrew Morton [this message]
2006-08-13 0:43 ` David Miller
2006-08-13 0:45 ` Andrew Morton
2006-08-13 1:09 ` David Miller
2006-08-13 1:22 ` Andrew Morton
2006-08-14 7:37 ` Jens Axboe
2006-08-14 8:44 ` David Miller
2006-08-14 8:51 ` Jens Axboe
2006-08-14 7:34 ` Jens Axboe
2006-08-13 14:31 ` Jens Axboe
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