From: Gunther Mayer <gunther.mayer@gmx.net>
To: Zwane Mwaikambo <zwane@mwaikambo.name>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH][RFC] per isr in_progress markers
Date: Tue, 10 Sep 2002 20:07:22 +0200 [thread overview]
Message-ID: <3D7E34DA.7010100@gmx.net> (raw)
In-Reply-To: Pine.LNX.4.44.0209092120310.1096-100000@linux-box.realnet.co.sz
Zwane Mwaikambo wrote:
>On Mon, 9 Sep 2002, Linus Torvalds wrote:
>
>
>
>>I agree with you, but that is only true for edge-triggered APIC
>>interrupts, though - for level-triggered ones we will just re-take the
>>interrupt when we unmask it again.
>>
>>Which is kind of sad. Is there some fast way to read the status of a
>>level-trigger irq off the IO-APIC in case it is still pending, and to do
>>the mitigation even for level-triggered?
>>
>>
>
>perhaps Remote IRR might help there?
>
>
>
>>(Btw, if there is, that would also allow us to notice the "constantly
>>screaming PCI interrupt" without help from the low-level isrs)
>>
>>
>
>As an aside, i just had an idea for another way to improve interrupt
>handling latency. Instead of walking through all the isrs in the chain,
>we can have an isr flag wether it was the source of the irq, and if so we
>stop right there and not walk through the other isrs.
>
This method is flawed for edge-triggered interrupts: you will miss any
interrupts which come in before you acked the first.
next prev parent reply other threads:[~2002-09-10 18:00 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-07 22:34 [PATCH][RFC] per isr in_progress markers Zwane Mwaikambo
2002-09-08 7:55 ` Ingo Molnar
2002-09-08 8:15 ` Ingo Molnar
2002-09-08 10:38 ` Zwane Mwaikambo
2002-09-08 13:31 ` Zwane Mwaikambo
2002-09-08 16:59 ` Zwane Mwaikambo
2002-09-08 22:01 ` Linus Torvalds
2002-09-08 23:03 ` Jeff Garzik
2002-09-09 6:49 ` bert hubert
2002-09-09 16:24 ` Linus Torvalds
2002-09-09 10:06 ` Ingo Molnar
2002-09-09 15:06 ` Linus Torvalds
2002-09-09 18:44 ` Ingo Molnar
2002-09-09 18:53 ` Linus Torvalds
2002-09-09 19:37 ` Zwane Mwaikambo
2002-09-09 19:23 ` Ingo Molnar
2002-09-09 20:05 ` Zwane Mwaikambo
2002-09-09 20:08 ` Andrew Morton
2002-09-10 15:05 ` David Woodhouse
2002-09-10 15:32 ` Alan Cox
2002-09-10 22:37 ` Gérard Roudier
2002-09-09 19:38 ` Maciej W. Rozycki
2002-09-10 11:55 ` Stephan von Krawczynski
2002-09-10 18:07 ` Gunther Mayer [this message]
2002-09-10 18:38 ` Zwane Mwaikambo
2002-09-10 7:46 ` Rogier Wolff
2002-09-08 10:57 ` Zwane Mwaikambo
2002-09-09 20:40 ` Alan Cox
2002-09-09 20:48 ` Andre Hedrick
2002-09-10 17:47 ` Zwane Mwaikambo
-- strict thread matches above, loose matches on Subject: below --
2002-09-09 9:49 zwane
2002-09-09 14:34 ` Robert Love
2002-09-09 18:23 ` Zwane Mwaikambo
2002-09-09 10:13 zwane
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