As (partly) discussed in https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=220281, the 1000 Hz timer interrupt (tick) rate in early 2.6 kernels has some bad effects. Most obviously, the frequent timer interrupts have a performance cost. Also significantly, ticks get lost fairly often at this high rate, so the kernel has code to detect and compensate for lost ticks, but this code is buggy (see http://bugzilla.kernel.org/show_bug.cgi?id=5127) and can add spurious ticks, making the clock run faster than real time. If the lost tick compensation is disabled (which is possible on 32-bit kernels using the clock=pit command-line flag), lost ticks occur and the clock runs slower than real time. All these effects occur on real hardware, but are much more severe in a virtual machine. (Of course one can avoid the problems by paravirtualizing time or moving to newer kernel versions that don't base timekeeping on counting interrupts, but this bug report is about stock RHEL4 kernels.) The divider= patch that was added to RHEL5 in response to https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=220281 helps with these issues by letting the user select a lower timer interrupt rate without recompiling the kernel. Can this patch be backported to RHEL4 as well?
committed in stream U7 build 68.5. A test kernel with this patch is available from http://people.redhat.com/~jbaron/rhel4/
*** Bug 429010 has been marked as a duplicate of this bug. ***
release note copied over from RHEL5.1 to RHEL4.7 for this bug. thanks!
Hi, the RHEL4.7 release notes deadline is on June 17, 2008 (Tuesday). they will undergo a final proofread before being dropped to translation, at which point no further additions or revisions will be entertained. a mockup of the RHEL4.7 release notes can be viewed here: http://intranet.corp.redhat.com/ic/intranet/RHEL4u7relnotesmockup.html please use the aforementioned link to verify if your bugzilla is already in the release notes (if it needs to be). each item in the release notes contains a link to its original bug; as such, you can search through the release notes by bug number. Cheers, Don
http://cvs.devel.redhat.com/cgi-bin/cvsweb.cgi/tests/nss_ldap/nss_ldap/bz429010/
An advisory 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 therefore 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-2008-0665.html
Added New Release Notes Contents.