From Bugzilla Helper: User-Agent: Mozilla/5.0 (compatible; Konqueror/3.2; Linux) (KHTML, like Gecko) Description of problem: This is a clone for RHEL 2.1 of bug #110170 I've opened it separately so this issue is tracked for both releases. Hardware Environment: x440 and x445 Software Environment: Distros based on kernels < 2.4.23 Version-Release number of selected component (if applicable): kernel-2.4.9-e.34 How reproducible: Sometimes Steps to Reproduce: 1. Boot RHEL 2.1 2. Observe the BogoMIPS rating given to each cpu Actual Results: Occasionally we'll see something like: Calibrating delay loop... 3.27 BogoMIPS Expected Results: Always seeing something like: Calibrating delay loop... 199.47 BogoMIPS Additional info: This issue is caused by the lost-tick compensation code in the 2.4 kernel using loops_per_jiffy before that value is calculated. This can cause loops_per_jiffy to be miscalculated, which may cause SCSI hangs at boot, occasional keyboard and mouse hangs in X, time running too fast, as well as other unseen issues. Normally the problem only occurs if the last cpu booted mis-calculates loops_per_jiffy, so it seems to show up rarely. The fix is to apply the patch submitted to lkml (now in 2.4.23-rc1) seen here: http://www.ussg.iu.edu/hypermail/linux/kernel/0311.0/0329.html Here is the patch included into 2.4.23-rc1As a side note, this problem was found while testing SLES8, so it has been fixed and does not affect SuSE
Created attachment 97505 [details] linux-2.4.23-pre9_cyclone-lpj-fix_A0.patch
i've commit it to the U4 update stream for summit
patch included in U4 erratum candidate
Tested the 2.4.9-e39summit kernel on an x440 and the issue seems to be resolved. BogoMIPS was correct on all cpus. This looks to be closable now.
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/RHSA-2004-105.html