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    SubjectRe: [announce] [patch] limiting IRQ load, irq-rewrite-2.4.11-B5

    On Wed, 3 Oct 2001, Linus Torvalds wrote:

    > [...] I would not be surprised if Ingo finds that trying to put the
    > machine under heavy disk load with multiple disk controllers might
    > also cause interrupt mitigation, which would be unacceptably BAD.

    well, just tested my RAID testsystem as well. I have not tested heavy
    IO-related IRQ load with the patch before (so it was not tuned for that
    test in any way), but did so now: an IO test running on 12 disks, (5 IO
    interfaces: 3 SCSI cards and 2 IDE interfaces) producing 150 MB/sec block
    IO load and a fair number of SCSI and IDE interrupts, did not trigger the
    overload code. I started the network overload utility during this test,
    and the code detected overload on the network interrupt (and only on the
    network interrupt). IO load is still high (down to 130 MB/sec), while a
    fair amount of networking load is handled as well. (While there certainly
    are higher IO loads on some Linux boxes, mine should be above the average
    IO traffic.)


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