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    SubjectUpdated Linux kernel preemption patches
    Available at:

    for kernel 2.4.9 and 2.4.8-ac12, respectively.

    This is a straight update of Nigel Gamble's Linux kernel preemption
    patch from, updated for the above
    kernels. Thus, this is Nigel's code -- I merely updated it.

    I am eager to see work done on the patch and to see what its future may
    be. If you are in any way interested in application latency or
    real-time support, I suggest you check this out. If you are just
    curious, its an interesting patch none-the-less.

    Some benchmarks:

    kernel 2.4.8-ac12 (nonpreempt):
    dbench 16:
    Throughput 12.9453 MB/sec (NB=16.1816 MB/sec 129.453 MBit/sec)
    dbench 1:
    Throughput 76.0099 MB/sec (NB=95.0123 MB/sec 760.099 MBit/sec)
    kernel compile (make dep clean bzImage):
    7:35.51 (386.34s user, 23.41s system)

    kernel 2.4.8-ac12 with preemptible kernel patch:
    dbench 16:
    Throughput 13.3579 MB/sec (NB=16.6974 MB/sec 133.579 MBit/sec)
    dbench 1:
    Throughput 31.4971 MB/sec (NB=39.3714 MB/sec 314.971 MBit/sec)
    kernel compile (make dep clean bzImage):
    7:23.26 (387.10s user, 23.42s system)

    The performance increase in kernel compile and dbench 16 is decent, but
    the decrease in dbench 1 is odd. I am curious what numbers others find.
    My "how does it feel" benchmark is that bandwidth seems similar while
    multitasking may be a tad smoother with the patch.

    Robert M. Love
    rml at
    rml at

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