Red Hat Bugzilla – Bug 81785
interactive preformance worse than for a long time...
Last modified: 2007-04-18 12:49:45 EDT
Description of problem:
I enjoy kompiling kernels while doing other things in gnome on my PIII 650 with
512 mb of ram. Lately this activity has become all but impossible. The
responsiveness for interactive work in phoebe is like it used to be around 2.4.0pre.
As a datapoint i tried vanilla kernel.org 2.4.18, and there interactive
responsiveness with that kernel is quite ok during kernel compile
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. kompile a kenel (especially during make depend)
2. try to for example use mozilla
the machine is almost grinding to a halt until the comiple finishes
better interactive repsonsiveness
please try the rawhide kernel; we fixed some major interactive response stuff in
there... please let me know how that one fares
I'm not sure that my rawhide mirror got the latest kernels, but when I try
kernel-2.4.20-2.12 it is about as bad as the one shipping with phoebe.
As a comparison i did a small test
1) packing up linux-2.4.20.tar.gz with tar
2) start 'make depend'
3) wait for 5 seconds to get the load up
4) switch workspace; reload a fastloading page in mozilla, switch to calendar
view in evolution and switch back to a large imap folder.
operation 4 takes about 10-15 seconds with kernel-2.4.18-19.8.0 (rh8 errata) but
about a minute in both kernel-2.4.20-2.2 and kernel-2.4.20-2.12. During that
time lots of klicks are lost and the system is generally very unresponsive.
Do you need any more info?
unfortunately i cannot reproduce your problems on a similar (slightly weaker)
could you try to run: "nice -n 19 make dep" instead of "make dep" - does that
make interactivity much better? This is to make sure it's a scheduler related
another thing, does the problem still trigger if you do:
make depend >/dev/null 2>/dev/null
sometimes the verbose output of 'make depend' loads the X server above a certain
level (but this should really not be the case here - you had no problems with
also, the 2.4.20-2.18 kernel should be available on rawhide, please try it - we
made some scheduler related changes since 2.4.20-2.12.
2.4.20-2.18 feels much better, subjectively even better than 2.4.18-x.
fyi nice -19 helped.
Could you retest the 2.4.20-2.21 kernel, without the nice -19 hack to make dep -
is interactivity as good as you'd expect it to be?
Just tested 2.4.20-2.21 and it feels snappy.
with or without 'nice -19' doesn't make any (noticeable) difference