Red Hat Bugzilla – Bug 450576
kjournald causes sporadic severe slowdown of system
Last modified: 2008-06-30 15:13:39 EDT
Description of problem: From time to time, kjournald causes the system response
time to slow down significantly. When it is done, system response time returns.
Version-Release number of selected component (if applicable):
For at least the last two kernels in Fedora 9, the .3 and .4 versions.
How reproducible: Can't make it happen at will, but it has happened from time
to time since I installed Fedora 9.
Steps to Reproduce:
1.Boot Fedora 9
2.Run for a period of time, with iotop enabled
3.When system is unresponsive, observe iotop, see kjournald running.
Actual results: System will slow to a crawl periodically while kjournald
completes its business.
Expected results: kjournald runs unobtrusively in background.
Additional info: Perhaps it is something else affecting kjournald, and
kjournald slowdown is the result.
I've been watching this since I opened the bugzilla. I notice that whenever it
occurs that Firefox seems to be using lots of IO as well. And occasinally
PDFlush. They all seem to want to use 99.99% of the IO capacity at the same
time, and there appears to be thrashing going on, as they swap in and out
quickly. So my instructions above to reproduce the bug should include using
Firefox. It seems to require retrieving extra content with Firefox, a search or
a link follow.
oh this is probably the firefox fsync issue...
... so hopefully upstream's fix will make it to fedora soon.
Thanks for the update. I guess this ticket can be relegated to the background now.
firefox updates are now available, which should fix this.
Yes, I updated as soon as the 3.0 final became available, and indeed it fixed this.
I guess this can be closes somehow.