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RE: [Xen-users] cpufreq problems with hvm
| To: | "Birger Brunswiek" <birger.b@xxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-users] cpufreq problems with hvm |
| From: | "Tian, Kevin" <kevin.tian@xxxxxxxxx> |
| Date: | Thu, 24 Jul 2008 09:24:34 +0800 |
| Cc: | |
| Delivery-date: | Wed, 23 Jul 2008 18:27:19 -0700 |
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| Thread-index: | AcjtBtpLLkibY8VSR5ePoFJeZBOLWwAI5TSQ |
| Thread-topic: | [Xen-users] cpufreq problems with hvm |
>From: Birger Brunswiek >Sent: 2008年7月24日 4:58 > >Hi all, >I was wondering if cpu frequency scaling in dom0 (using the >cpufreq=dom0-kernel >boot parameter) may cause problems with HVM domUs? This is on >Xen 3.2.1. > >PV domUs seem to work just fine. They adjust to the frequency >change on the go. >The HVM I run using the unmodified_driver drivers (also from >the 3.2.1 release) >seem to have very slow timers if dom0 lowers the frequency. > Current HVM can't cope with freq/tsc change, unless all rdtsc are trapped which then may bring other side-effects for heavy overhead. It's better for you to try cpufreq on a platform with constant TSC, e.g. any Intel processors supporting VT. Thanks, Kevin _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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