From: kurt.van.dijck@eia.be (Kurt Van Dijck)
To: linux-arm-kernel@lists.infradead.org
Subject: IRQ handler under load - slow response
Date: Wed, 9 Mar 2011 16:22:53 +0100 [thread overview]
Message-ID: <20110309152252.GB333@e-circ.dyndns.org> (raw)
In-Reply-To: <AANLkTinTCfrPPwP6ZnWZTWW8vmR4=Uaw+OmHK7b99-9g@mail.gmail.com>
On Wed, Mar 09, 2011 at 03:02:06PM +0100, Arno Steffen wrote:
> ------------------
>
> What have I done wrong?
You put code with different scheduling needs in the same scheduling pool.
> Do I have a chance to speed up the response
> from changing inputs?
I've been playing with scheduling policies before (I'm not the expert).
My hint:
your tasklet is executed in the softirq handler. This will run at normal
priority (see '$ ps -jefHc' for example)
a)
You could 'chrt --rr PID' of your softirqd
b)
replace your tasklet with a threaded irq handler, which you can
'chrt --rr PID'. This has the effect that only your own piece of code
is raised in priority.
>
> best regards
> Steffen
Hope this will help.
Kurt
next prev parent reply other threads:[~2011-03-09 15:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-09 14:02 IRQ handler under load - slow response Arno Steffen
2011-03-09 15:22 ` Kurt Van Dijck [this message]
2011-03-14 13:26 ` Arno Steffen
2011-03-14 14:47 ` Kurt Van Dijck
2011-03-24 11:56 ` Arno Steffen
2011-03-24 14:45 ` Kurt Van Dijck
2011-03-25 8:46 ` Arno Steffen
2011-03-25 9:53 ` Kurt Van Dijck
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