2.5.66-mm2
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Quoted 4 lines · Andrew Morton
There is a small patch from Ingo here against the CPU scheduler which we hope will fix the new starvation problems which people have been reporting. I this is you, please test and report.
I patched 2.5.66 with:
http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.66-mm2-1.gz
I can still easily reproduce my starvation problem with:
cat cedo.iso | bzip2 > /tmp/cedo.iso.bz2
(cedo.iso is a 700MB CD image)
On another virtual console, I run the following script to demonstrate the starvation:
#!/bin/sh
while true; do
sleep 30
date
ps x
date
echo -----
done
At first, everything is OK:
Tue Apr 1 18:00:03 CEST 2003
PID TTY STAT TIME COMMAND 301 tty1 S 0:00 -bash 302 tty2 S 0:00 -bash 647 tty1 S 0:00 cat cedo.iso 648 tty1 R 0:54 bzip2 651 tty2 S 0:00 /bin/sh ./test-interactivity.sh 652 tty2 S 0:00 tee inter-2.5.66mm2.potreti 655 tty2 R 0:00 ps x Tue Apr 1 18:00:03 CEST 2003 ----- Tue Apr 1 18:00:33 CEST 2003 PID TTY STAT TIME COMMAND 301 tty1 S 0:00 -bash 302 tty2 S 0:00 -bash 647 tty1 S 0:00 cat cedo.iso 648 tty1 R 1:24 bzip2 651 tty2 S 0:00 /bin/sh ./test-interactivity.sh 652 tty2 S 0:00 tee inter-2.5.66mm2.potreti 659 tty2 R 0:00 ps x
Tue Apr 1 18:00:33 CEST 2003
-----
But after a while the problem appears:
-----
Tue Apr 1 18:05:09 CEST 2003
PID TTY STAT TIME COMMAND 301 tty1 S 0:00 -bash 302 tty2 S 0:00 -bash 647 tty1 D 0:01 cat cedo.iso 648 tty1 S 5:55 bzip2 651 tty2 S 0:00 /bin/sh ./test-interactivity.sh 652 tty2 S 0:00 tee inter-2.5.66mm2.potreti 1043 tty2 R 0:00 ps x Tue Apr 1 18:05:11 CEST 2003 ----- Tue Apr 1 18:05:49 CEST 2003 PID TTY STAT TIME COMMAND 301 tty1 S 0:00 -bash 302 tty2 S 0:00 -bash 647 tty1 S 0:01 cat cedo.iso 648 tty1 R 6:37 bzip2 651 tty2 S 0:00 /bin/sh ./test-interactivity.sh 652 tty2 S 0:00 tee inter-2.5.66mm2.potreti 1047 tty2 R 0:00 ps x Tue Apr 1 18:05:51 CEST 2003 ----- Tue Apr 1 18:06:21 CEST 2003 PID TTY STAT TIME COMMAND 301 tty1 S 0:00 -bash 302 tty2 S 0:00 -bash 647 tty1 D 0:01 cat cedo.iso 648 tty1 S 7:23 bzip2 651 tty2 S 0:00 /bin/sh ./test-interactivity.sh 652 tty2 S 0:00 tee inter-2.5.66mm2.potreti 1051 tty2 R 0:00 ps x Tue Apr 1 18:06:38 CEST 2003 ----- Tue Apr 1 18:07:08 CEST 2003 PID TTY STAT TIME COMMAND 301 tty1 S 0:00 -bash 302 tty2 S 0:00 -bash 647 tty1 D 0:01 cat cedo.iso 648 tty1 S 7:59 bzip2 651 tty2 S 0:00 /bin/sh ./test-interactivity.sh 652 tty2 S 0:00 tee inter-2.5.66mm2.potreti 1055 tty2 R 0:00 ps x Tue Apr 1 18:07:14 CEST 2003 ----- Tue Apr 1 18:07:53 CEST 2003 PID TTY STAT TIME COMMAND 301 tty1 S 0:00 -bash 302 tty2 S 0:00 -bash 647 tty1 S 0:01 cat cedo.iso 648 tty1 R 8:37 bzip2 651 tty2 R 0:00 /bin/sh ./test-interactivity.sh 652 tty2 S 0:00 tee inter-2.5.66mm2.potreti 1059 tty2 R 0:00 ps x Tue Apr 1 18:08:03 CEST 2003 ----- Tue Apr 1 18:08:33 CEST 2003 PID TTY STAT TIME COMMAND 301 tty1 S 0:00 -bash 302 tty2 S 0:00 -bash 647 tty1 D 0:01 cat cedo.iso 648 tty1 S 9:38 bzip2 651 tty2 S 0:00 /bin/sh ./test-interactivity.sh 652 tty2 S 0:00 tee inter-2.5.66mm2.potreti 1066 tty2 R 0:00 ps x
Tue Apr 1 18:08:54 CEST 2003
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I use Debian Woody on Athlon 800MHz, Asus A7V, 384MB RAM, disk WDC WD800JB-00CRA1, nVidia Geforce2 MX, Realtek RTL-8139C, SB Live. GCC is 2.95.4.
Michal