Messages in this thread | | | Date | Wed, 21 Feb 2007 13:04:12 -0500 | From | "Lee Revell" <> | Subject | Re: High CPU usage with sata_nv |
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On 2/21/07, Matthew Fredrickson <creslin@digium.com> wrote: > It's a 2.6.18 kernel. What we're seeing (by means of the interrupt pin > on another card) is extremely large interrupt latency (measured from > the time the interrupt pin goes low to the first couple lines of code > in the IRQ handler to clear it) occasionally, in the order of 500-700 > microseconds. I figured it was some other driver on the system > disabling irqs for a long period of time, but it's difficult to trace > what might be doing that.
Apply the -rt kernel patch and enable the latency tracer, it will tell you what code path is responsible.
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