2.5.66-(bk) == horrible response times for non X11 applications

Zwane Mwaikambo (zwane@linuxpower.ca)
Sun, 6 Apr 2003 18:36:34 -0400 (EDT)

The X server is not reniced nor are any of the called tasks. This is very
easy to reproduce by doing the following;

open two xterms, run glxgears from one and then 5 or so seconds after that
run an application which you can easily determine completion, such as
ifconfig. You will notice that the console app doesn't make much progress
and essentially get's starved.

ifconfig R 00000000 5738320 1213 1032 (NOTLB)
Call Trace:
[<c011ee20>] autoremove_wake_function+0x0/0x40
[<c02b6462>] generic_make_request+0x112/0x1b0
[<c011dc4d>] io_schedule+0x2d/0x40
[<c015851a>] __wait_on_buffer+0xba/0xc0
[<c011ee20>] autoremove_wake_function+0x0/0x40

glxgears S C010A1E8 4265977488 1209 1019 (NOTLB)
Call Trace:
[<c010a1e8>] common_interrupt+0x18/0x20
[<c01298d5>] schedule_timeout+0xb5/0xc0
[<c03e8490>] unix_poll+0x20/0x90
[<c0391e69>] sock_poll+0x19/0x20
[<c0169c22>] do_select+0x132/0x270
[<c0169960>] __pollwait+0x0/0xa0

Afflicted system was;

K6 500MHz laptop
128M RAM w/ 8M shared (Trident X11 Server)

This was not reproduceable with 2.4.18-3 nor with 2.5.66 and the
following patch applied;

http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.5/2.5.66/2.5.66-mm3/broken-out/sched-interactivity-backboost-revert.patch

-- 
function.linuxpower.ca
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