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    SubjectRe: swapping and the value of /proc/sys/vm/swappiness
    Marcelo,

    For what it is worth, here are the benchmark results for the kernel with the
    patch I discussed before, along with the previous 2.6.9-rc1-mm3 results:

    Kernel Version 2.6.9-rc1-mm3:
    Total I/O Avg Swap min max pg cache min max
    ----------- --------- ------- ------ --------- ------- -------
    0 274.80 MB/s 10511 MB ( 5644, 14492) 13293 MB ( 8596, 17156)
    20 267.02 MB/s 12624 MB ( 5578, 16287) 15298 MB ( 8468, 18889)
    40 267.66 MB/s 13541 MB ( 6619, 17461) 16199 MB ( 9393, 20044)
    60 233.73 MB/s 18094 MB ( 16550, 19676) 20629 MB ( 19103, 22192)
    80 213.64 MB/s 20950 MB ( 15844, 22977) 23450 MB ( 18496, 25440)
    100 164.58 MB/s 26004 MB ( 26004, 26004) 28410 MB ( 28327, 28455)

    Kernel Version 2.6.9-rc1-mm3-kdb-nrmap:
    Total I/O Avg Swap min max pg cache min max
    ----------- --------- ------- ------ --------- ------- -------
    0 286.93 MB/s 7288 MB ( 4847, 14536) 10122 MB ( 7771, 17138)
    20 252.43 MB/s 13305 MB ( 3950, 18337) 15938 MB ( 6866, 20876)
    40 268.52 MB/s 11538 MB ( 5333, 17298) 14238 MB ( 8247, 19836)
    60 242.72 MB/s 16367 MB ( 8652, 21217) 18909 MB ( 11514, 23561)
    80 212.94 MB/s 19424 MB ( 5632, 24047) 21937 MB ( 8567, 26469)
    100 161.66 MB/s 26006 MB ( 26004, 26007) 28445 MB ( 28407, 28471)

    Except for the swappiness = 20 case, things are a smallish bit better for
    the modified kernel than 2.6.9-rc1-mm3. Clearly we haven't found the root of
    this problem yet.

    Have you still been unable to duplicate this problem on a small i386 platform?
    --
    Best Regards,
    Ray
    -----------------------------------------------
    Ray Bryant
    512-453-9679 (work) 512-507-7807 (cell)
    raybry@sgi.com raybry@austin.rr.com
    The box said: "Requires Windows 98 or better",
    so I installed Linux.
    -----------------------------------------------

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