Rick Barnes wrote: > > Akemi Yagi wrote: >> On Jan 8, 2008 4:51 AM, Rick Barnes <linux@xxxxxxxxxxxxxx> wrote: >>> Jack Bailey wrote: >>>> These domains are fully virtualized and set up identically, except >>>> "badclock" is allocated two processors versus one processor for >>>> "goodclock". DomU's clock is running normally. >>>> >>>> Anyone know what's going or know how to fix it? >>> This is a known issue that has come up on this list a lot. >>> >>> For C5.1 see the first known issue: >>> >>> http://wiki.centos.org/Manuals/ReleaseNotes/CentOS5.1/ >>> >>> Rick >> Please note that the clock rate issue in that description applies to >> non-xen kernels. xen kernels are set to 250Hz by default. > > "With this option you can reduce the clock rate from the default of > 1000HZ to 100HZ which is desirable in a virtual machine." > > If it does not apply to xen then this should be made more clear. > The first note is to address the fact the "divider=" and not "tick_divider=" should be used ... though the actual usage is detailed in the upstream release notes: http://www.centos.org/docs/5/html/release-notes/as-x86/RELEASE-NOTES-U1-x86-en.html This does say (well sort of) that it can not be used on Xen: "Note that the virtualized kernel does not support multiple timer rates on guests. dom0 uses a fixed timing rate set across all guests; this reduces the load that multiple tick rates could cause." Regardless ... divider= is not for xen kernels, only normal kernels. Thanks, Johnny Hughes
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