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SubjectRe: Timer Interrupts, please CC
Kendrick Hamilton wrote:
> Hello,
> Please send/cc responses to hamilton@sedsystems.ca
> We are using a custom modulator card with the Linux 2.2.16 kernel
> running on an IBM e-server (dual 2.8GHz, a lot of RAM). The modulator
> card uses interrupts to send data (the card has a large FIFO and
> interrupts when almost empty). The interrupt service routine re-fills
> the fifo. While it is re-filling the FIFO interrupts are disabled. We
> are noticing horrible clock skew.
> Can you tell me the frequency of timer interrupts used by the linux
> 2.2.16 kernel on Intel x86 SMP platform. I want to know how long my
> interrupt service routine can leave the interrupt disabled.

Two VERY different questions IMNSHO. :)

The normal tick time for the x86 platform on 2.4.x kernels was/is
10ms. The interrupt latency, on the other hand, is usually well under
1ms. Shame to see that go up.



--
George Anzinger george@mvista.com
High-res-timers: http://sourceforge.net/projects/high-res-timers/
Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml

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