Red Hat Bugzilla – Bug 137996
USB harddisk causes 100% cpu load when copying large files
Last modified: 2007-11-30 17:07:04 EST
Description of problem:
when copying a large file to a USB harddisk, the CPU load goes up to
100% (used by usb-storage-1)
Small files or using an older kernel (2.4.21-15.0.4) does not show
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Attach USB storage device
2. mount it
3. copy a large file to the mounted device
system is stuck in 100% usage of usb-storage-1
I know of the accuracy of "small" and "large" files :), but no
testing was done where the threshold is.
There were VM changes in U4 that might address this. Does this problem
occur with the U4 beta kernel (2.4.21-23.EL)?
Thomas, please attach a "top" output and get several "AltSysrq W"
outputs when the system is in this state so I can see what process is
running and exactly what routines it is running. Please use the
latest RHEL3-U4 kernel since we fixed a problem in prune_icache that
looks exactly like this.
That kernel is here: http://people.redhat.com/~lwoodman/RHEL3/
Hi, I am the customer who had this problem and Thomas created this
bugreport for me. As I was unable to install the beta U4 Kernel I
installed the U4 release today - and the problem is gone.
Thanks & many greetings
An errata has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.