Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 09 Sep 2003 15:39:39 -0700 | From | George Anzinger <> | Subject | Re: Timer Interrupts, please CC |
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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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