Re: PCI DMA Interrupt latency

[Lee Revell]

On Tue, 2006-01-10 at 17:59 -0600, Robert Hancock wrote:
> Most likely some driver is disabling interrupts for that period, which 
> is really longer than it should be. However, if your card/driver require 
> such tight interrupt latency to function correctly, that seems too 
> fragile and may not be reliable. Some kind of ringbuffer arrangement 
> would likely work better, so that the interrupt does not have to be 
> serviced so soon.
> 

You can easily tell if this is the case by applying these patches:

http://people.redhat.com/mingo/latency-tracing-patches/latency-tracing-patches-2.6.15-rc7.tar.gz

It says -rc7 but they apply cleanly and work with 2.6.15 final.

Lee

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