Re: Should kirqd work on HT?

[Martin J. Bligh]

--Jeff Garzik <jgarzik@xxxxxxxxx> wrote (on Saturday, February 19, 2005 11:30:53 -0500):

> Pallipadi, Venkatesh wrote:
>> You are right. Kernel balancer doesn't move around the irqs, unless it
>> has too many interrupts. The logic is moving around interrupts all the
>> time will not be good on caches. So, there is a threshold above which
>> the balancer start moving things around.
>> 
>> You should see them moving around if you do 'ping -f' or a big 'dd' from
>> the disk.
> 
> If kirqd is moving NIC interrupts, it's broken.
> 
> (and another reason why irqbalanced is preferable)

Why is it broken to move NIC interrupts? Obviously you don't want to
rotate them around a lot, but in the interests of fairness to other 
processes, it seems reasonable to migrate them occasionally (IIRC, kirqd
rate limits to once a second or something).

M.

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