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    SubjectRe: Hard locks under high interrupt load?
    On Fri, 27 Feb 2004, Dan Creswell wrote:

    > I'm having zero success in getting 2.6.3 stable under interrupt load. I
    > can kill my machine in a variety of fashions all of which appear, to my
    > naive eye, related to interrupt load:
    > (1) LAN traffic via E1000 card (X is not running)
    > (2) Running X for more than a few minutes - starting up a couple of
    > applications whilst performing some disk-based activity (such as a
    > compile) usually seems to do the trick.
    > (2) is worth a little more examination. I have an NVIDIA card (I can
    > hear you all groan) *but* I get the same results with the XFree driver
    > *or* the proprietary NVIDIA driver.
    > Disabling IO-APIC usage seems to resolve the problem.

    Does the 'noirqbalance' kernel parameter also serve as a workaround? Are
    you using any userspace irq balancers?

    > Machine is a dual Xeon, Tyan S2665 (E7505 chipset) with an MPT-Fusion
    > SCSI controller.
    > 2.4.26-pre1 and various other 2.4 kernels give me no problems at all. I
    > really want to switch my machines over to 2.6 but I can't whilst this
    > problem persists.
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