Messages in this thread | | | Subject | Re: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option | From | Lee Revell <> | Date | Wed, 20 Oct 2004 13:55:33 -0400 |
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On Wed, 2004-10-20 at 13:58, Timothy Miller wrote: > Lee Revell wrote: > > On Wed, 2004-10-20 at 11:35, Arjan van de Ven wrote: > > > >>On Wed, Oct 20, 2004 at 11:46:32AM -0400, Timothy Miller wrote: > >> > >>>The rules about how long a hard irq would be allowed to run would have > >>>to be draconian. > >> > >>they already are. > > > > > > The IDE I/O completion in hardirq context means that one can run for > > almost 3ms. Apparently at OLS it was decided that the target for > > desktop responsiveness was 1ms. So this is a real problem. > > What is happening that takes 3ms, and why can't it be broken up? >
http://lkml.org/lkml/2004/7/24/26
> Are you talking here about PIO? Is there a limited amount of time you > have to do the PIO before the data goes away? It may be acceptable to > just live with PIO being slow, since high-performance systems will all > be using DMA anyhow. >
Nope, DMA.
> > > > What exactly do you mean by "draconian"? > > In this case, I mean extremely harsh and restrictive. Usually, it means > "excessively harsh", but in this case, I mean that in a good way. :) >
Heh, I know what the word means, I was asking what the specific rules are that could be considered as such.
Lee
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