Subject: Re: [linux-audio-dev] IRQ rotation
From: Tim Hockin (thockin_AT_hockin.org)
Date: Fri Mar 05 2004 - 19:09:31 EET
On Fri, Mar 05, 2004 at 03:06:27PM +0000, Steve Harris wrote:
> It used to be possible (in the 2.0 kernel series) to the rotate priority of
> IRQs on the two controllers. This sounds really good as on my laptop the
> soundcard is welded to IRQ5 (very low priority) and everything else is on
> IRQ10 (higher, c.f. http://myweb.cableone.net/eviltwin69/Arcana.html sec
> 2.4), so I can only run the card with big buffers.
This really mattered? I'm honestly DEEPLY surprised, and a bit sceptical.
IRQ priority will only matter AT ALL if you are in a constant state of
interrupt, or your IRQ handlers are painfully slow, neither of which should
be true.
DMA ATA mitigates IRQ storms a LOT, and you shouldn't be flooding the net
while you play low-latency audio. Those are the two biggest sources of
IRQs.
Curious to see how it changes with a new laptop..
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