Re: [SLUG] 2.4 VM is broken

From: Mark (mark@bish.net)
Date: Wed Jun 06 2001 - 12:33:24 EDT


I noticed this last week when I finally got around to getting my swap
running on this new drive. I have seen the same thing - just been too
busy to say something. I'll try your exact test and get back to you.

On Wed, 6 Jun 2001, Derek Glidden wrote:

>
> I've kicked up a bit of an ant's nest on LKML about the state of VM/swap
> under 2.4. If you were at the dinner with Maddog, I ranted about this
> for a bit and you might remember some of the problems. I finally sat
> down to do some actual tests against the 2.4 VM subsystem and came up
> with some really ridiculous results. You might find this interesting
> reading. (and then again, you may not...)
>
> http://marc.theaimsgroup.com/?t=99178003800001&w=2&r=1
>
> This is the only LKML archive I've been able to get to the past couple
> of days, probably because of the PSI depeering by C&W. Unfortunately,
> it lists the thread in reverse-chronological order so it's not very
> intuitive the way it's presented as you'll have to start on the "Next"
> page to get the beginning of the thread...
>
> --
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> #!/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.eff.org/ http://www.opendvd.org/
> http://www.cs.cmu.edu/~dst/DeCSS/Gallery/
>

------------------------------------------------------------------------
| Mark Bishop (mark@bish.net) | Computer Engineer |
| 813.258.2390 | Network Engineer |
| http://bish.net | Embedded Programmer |



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