Messages in this thread | | | Date | Mon, 9 Sep 2002 12:06:26 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: [PATCH][RFC] per isr in_progress markers |
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On Sun, 8 Sep 2002, Linus Torvalds wrote:
> As far as I can tell, the only time when this might be an advantage is > an SMP machine with multiple devices sharing an extremely busy irq line. > Then the per-isr in-progress bit allows multiple CPU's to actively > handle several of the devices at the same time. > > Or is there some other case where this is helpful?
it could also improve latency of a faster interrupt source that shares its irq line with a slow (but still frequent) handler. (such as SCSI or ne2k.) This is both on UP and on SMP.
although this might be less of an issue these days.
Ingo
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