From: jamal <hadi@cyberus.ca>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@transmeta.com>,
<linux-kernel@vger.kernel.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Arjan van de Ven <arjanv@redhat.com>,
Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>, <netdev@oss.sgi.com>
Subject: Re: [patch] auto-limiting IRQ load take #2, irq-rewrite-2.4.11-F4
Date: Wed, 3 Oct 2001 11:16:33 -0400 (EDT) [thread overview]
Message-ID: <Pine.GSO.4.30.0110031114490.4833-100000@shell.cyberus.ca> (raw)
In-Reply-To: <Pine.LNX.4.33.0110031625330.7342-101000@localhost.localdomain>
Your approach is still wrong. Please do not accept this patch.
cheers,
jamal
On Wed, 3 Oct 2001, Ingo Molnar wrote:
>
> the attached patch contains a cleaned up version of IRQ auto-mitigation.
>
> - i've removed the max_rate limit and have streamlined the impact of the
> load-estimator on do_IRQ() to this piece of code:
>
> desc->total_contexts++;
> if (unlikely(in_interrupt()))
> goto mitigate_irqload;
>
> i dont think we can get much cheaper than this. (We could perhaps avoid
> the total_contexts counter by saving a 'snapshot' of the existing
> kstat.irqs array of counters in every timer tick and comparing the
> snapshot to the current kstat.irqs values. That looked pretty unclean
> though.)
>
> - the per-cpu irq counting in -D9 was incorrect as it collapsed all irq
> handlers into a single counter.
>
> - i've removed the net-polling hacks - they are unrelated to this problem.
>
> the patch is against 2.4.11-pre2. (the eepro100.c fixes from the -ac tree
> are already included in -pre2, i only included them in this patch to make
> patching & testing against 2.4.10 easier.).
>
> (i'd like to stress the point again that the goal of this approach is
> *not* to be nice. This is an airbag mechanizm, it can and will hurt
> performance. But my box does not lock up anymore.)
>
> Ingo
>
next prev parent reply other threads:[~2001-10-03 15:19 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-01 22:16 [announce] [patch] limiting IRQ load, irq-rewrite-2.4.11-B5 Ingo Molnar
2001-10-01 22:26 ` Tim Hockin
2001-10-01 22:50 ` Ingo Molnar
2001-10-01 22:36 ` Andreas Dilger
2001-10-01 22:50 ` Ben Greear
2001-10-02 14:30 ` Alan Cox
2001-10-02 20:51 ` Ingo Molnar
2001-10-01 23:03 ` Linus Torvalds
2001-10-02 20:34 ` [patch] auto-limiting IRQ load, IRQ-polling, irq-rewrite-2.4.11-D9 Ingo Molnar
2001-10-03 14:51 ` [patch] auto-limiting IRQ load take #2, irq-rewrite-2.4.11-F4 Ingo Molnar
2001-10-03 15:16 ` jamal [this message]
2001-10-03 16:51 ` Rik van Riel
2001-10-02 6:50 ` [announce] [patch] limiting IRQ load, irq-rewrite-2.4.11-B5 Marcus Sundberg
2001-10-03 8:47 ` Ingo Molnar
2001-10-03 16:23 [patch] auto-limiting IRQ load take #2, irq-rewrite-2.4.11-F4 Manfred Spraul
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