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    Subjectzcache preliminary benchmark results
    Last November, in an LKML thread I would rather forget*, James
    Bottomley and others asked for some benchmarking to be done for
    zcache (among other things). For various reasons, that benchmarking
    is just now getting underway and more will be done, but it might be
    useful to publish some interesting preliminary results now.

    Summary: On a kernel compile "make -jN" workload, with different
    values of N to test varying memory pressure, zcache
    shows no performance loss when memory pressure is low,
    and up to 31% performance improvement when memory pressure
    is moderate to high. RAMster does even better.

    (Note that RAM is intentionally constrained to 1GB to force
    memory pressure for higher N in the workload.)

    * thread summarized in LWN (http://lwn.net/Articles/465317/)

    =========

    Benchmark results and description:

    (all results in seconds so smaller is better)
    N= nozcache zcache faster by RAMster faster by
    4 879 877 0% 887 -1%
    8 858 856 0% 866 -1%
    12 858 856 0% 875 -2%
    16 1009 922 9% 949 6%
    20 1316 1154 14% 1162 13%
    24 2164 1714 26% 1788 21%
    28 3293 2500 31% 2177 51%
    32 4286 4282 0% 3599 19%
    36 6516 6602 -1% 5394 22%
    40 DNC 13755 8172 68% (over zcache)

    DNC=did not complete: stopped after 5 hours = 18000

    Workload:
    kernel compile "make -jN" with varying N
    measurements in elapsed seconds
    boot kernel: 3.2 + frontswap/ramster commits
    Oracle Linux 6 distro with ext4
    fresh reboot for each test run
    all tests run as root in multi-user mode

    Hardware:
    Dell Optiplex 790 = ~$500 (two used for RAMster)
    Intel Core i5-2400 @ 3.10 GHz, 4coreX2thread, 6M cache
    1GB RAM DDR3 1333Mhz (for RAMster, other server has 8GB)
    One 7200rpm SATA 6.0Gb/s drive with 8MB cache
    10GB swap partition


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