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    Subjectkernel performance issues 2.4.7 -> 2.4.17-pre8

    I wanted to create an automated performance test battery that I
    could run against new kernels as a validation for the environments that I
    work with.

    What I did:

    I decided I would run dbench and tbench with increasing number of
    instances from 1 to 10. I would also run Bonnie starting with the base
    memory size, and then run it with twice the memory size and finally four
    times the memory size of the machine. I tested various kernel
    configurations. I have to have ipsec for the kernels I run, so all of these
    kernels have the ipsec patches in them. However, since the Red Hat kernel
    does not include the freeswan patches I brought down ipsec in all my test

    Hardware used:

    A HP desktop with a Pentium III-500, 128M memory, 20 Gig harddrive.
    The hardware was the same for all tests.

    Software used:

    Dbench, tbench and bonnie.
    These tests were run immediately upon startup of the machine, so all
    processes where the same for all tests.
    (This is an attempt to keep as many conditions the same as possible
    while changing out only the kernel)


    In the results table the first column is the directory that I used
    to store my results. The kernels that match these directories are :

    Test-2.4.07-10-(timestamp) == Red Hat 7.2 base kernel
    Test-2.4.09-13-(timestamp) == Red Hat 7.2 update kernel
    Test-2.4.10ipsec-(timestamp) == 2.4.10 with freeswan patches
    Test-2.4.14ipsec-(timestamp) == 2.4.14 with freeswan patches
    Test-2.4.15ipsec-(timestamp) == 2.4.15 with freeswan patches (
    and the umount pacth)
    Test-2.4.16ipaup-(timestamp) == 2.4.16 with freeswan, aa, and
    preemptable patches
    Test-2.4.16ipsec-(timestamp) == 2.4.16 with freeswan patches
    Test-2.4.16ipsp-(timestamp) == 2.4.16 with freeswan, and
    preemptable patches
    Test-2.4.17-pre8-(timestamp) == 2.4.16 with freeswan, and 17-pre8

    What I found:

    Overall I discovered that the Red Hat modified kernel beat the stock
    kernel hands down in throughput. Both the base Red Hat 7.2 kernel and the
    7.2 update kernel (2.4.7-9, 2.4.9-13 respectively) had far better throughput
    than the .10, .15, .14, .16, and .17-pre8 kernels.


    I have attached the results to this email as a gzipped html
    attachment. It is simple a HTML TABLE that describes all of my results.

    What I am looking for:

    Guidance. Could someone tell me what if anything I am doing wrong
    with my tests, or point me in the direction to look where I can begin
    understanding why the throughput performance dropped?




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