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 this behavior. Version-Release number of selected component (if applicable): 2.4.21-20 How reproducible: Always. Steps to Reproduce: 1. Attach USB storage device 2. mount it 3. copy a large file to the mounted device Actual results: system is stuck in 100% usage of usb-storage-1 Expected results: Additional info: 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/ Larry Woodman
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 Dominique
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. http://rhn.redhat.com/errata/RHBA-2004-550.html