Date: Mon, 13 Sep 2004 09:32:59 +0200
From: Jens Axboe <axboe@suse.de>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Andrea Arcangeli <andrea@novell.com>, Ingo Molnar <mingo@elte.hu>,
       Chris Wedgwood <cw@f00f.org>, Arjan van de Ven <arjanv@redhat.com>,
       Hugh Dickins <hugh@veritas.com>, "Martin J. Bligh" <mbligh@aracnet.com>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       LKML <linux-kernel@vger.kernel.org>,
       Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option
Message-ID: <20040913073259.GF2326@suse.de>
References: <20040910151538.GA24434@devserv.devel.redhat.com> <20040910152852.GC15643@x30.random> <20040910153421.GD24434@devserv.devel.redhat.com> <1095016687.1306.667.camel@krustophenia.net> <20040912192515.GA8165@taniwha.stupidest.org> <20040912193542.GB28791@elte.hu> <20040912203308.GA3049@dualathlon.random> <1095025000.22893.52.camel@krustophenia.net> <20040912220720.GC3049@dualathlon.random> <1095027951.22893.69.camel@krustophenia.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1095027951.22893.69.camel@krustophenia.net>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 680
Lines: 17

On Sun, Sep 12 2004, Lee Revell wrote:
> I am still unsure why the IDE i/o completion is the one place that
> breaks the assumption that hardirq handlers execute quickly.

I'm not sure why you think so. You also mention IDE as being the
'glaring exception' and it's definitely wrong. Most drivers run the
completion from hardirq context, SCSI is the exception since it does it
defers the completion to softirq context.

-- 
Jens Axboe

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/