Axp-List Archive
Re: IRQ's (was Re: Linux Driver)

Subject: Re: IRQ's (was Re: Linux Driver)
From: Rich Payne (rdp@talisman.alphalinux.org)
Date: Sat Nov 4 05:12:00 2000


> This is a little off topic but I thought the comparison
> was interesting. The lack of interrupts on the second cpu
> of the UP2K I find a bit worrisome. Implies that the
> interrupts aren't split so one processor is more loaded if you
> do heavy I/O or network accesses. I'd prefer the overhead
> be spread across both cpus. Thats because my codes assume
> both cpus are equal and by only putting overhead on one
> cpu, it slows BOTH cpus down to that slower level, essentially
> wasting cycles on the second cpu because it can get it's
> workload done more quickly than the other cpu servicing
> interrupts...

This is fixed in 2.4. There may even be patches against 2.2 that
distribute the interupts. I think it was Andrea Arcangeli who
did the work.

--rdp

-- 
Rich Payne
rpayne@alphalinux.org			www.alphalinux.org

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