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    SubjectLinux 2.2 and 2.4 VM systems analysed

    I've been following the 2.4 VM issues since the early 2.4-pre days. As
    a "power user" and someone who uses Linux at work, the kernel's
    stability is of great interest to me. Finally, I got sick of trying to
    interpret the data from various sources on how well the 2.4 VM systems
    perform overall and in comparison with each other and other systems. So
    I ran my own tests against 2.4.12-ac6, 2.4.13, and 2.2.19 and wrote up
    the results:

    "An analysis of three Linux kernel VM systems"

    http://www.nks.net/linux-vm.html

    The conclusion in a nutshell is that yes, the 2.4 kernel VM systems
    still have a few quirks to work out, but overall they are so
    significantly better than the 2.2 VM that there really is no
    comparison.

    However, this "significantly better" conclusion is for certain
    high-stress situations where the 2.2 VM apparently fails entirely, while
    2.4 chugs along with barely a notice.

    For overall end-user experience, 2.2 still "feels" better overall with
    better interactive responsiveness under a varying set of loads even
    though 2.4 really is faster at doing the actual work.

    Comments, responses, suggestions welcome. Flames will be cheerfully
    redirected to /dev/null.

    --
    -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
    #!/usr/bin/perl -w
    $_='while(read+STDIN,$_,2048){$a=29;$b=73;$c=142;$t=255;@t=map
    {$_%16or$t^=$c^=($m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;
    $t^=(72,@z=(64,72,$a^=12*($_%16-2?0:$m&17)),$b^=$_%64?12:0,@z)
    [$_%8]}(16..271);if((@a=unx"C*",$_)[20]&48){$h=5;$_=unxb24,join
    "",@b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$d=
    unxV,xb25,$_;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=$t&($d
    >>12^$d>>4^$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*
    8^$q<<6))<<9,$_=$t[$_]^(($h>>=8)+=$f+(~$g&$t))for@a[128..$#a]}
    print+x"C*",@a}';s/x/pack+/g;eval

    usage: qrpff 153 2 8 105 225 < /mnt/dvd/VOB_FILENAME \
    | extract_mpeg2 | mpeg2dec -

    http://www.cs.cmu.edu/~dst/DeCSS/Gallery/
    http://www.eff.org/ http://www.anti-dmca.org/
    http://www.sciencemag.org/cgi/content/full/293/5537/2028
    -
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