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[Xen-devel] xenoprof passive mode overhead
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
|---|---|
| Subject: | [Xen-devel] xenoprof passive mode overhead |
| From: | Ya-Yunn Su <yayunn.su@xxxxxxxxx> |
| Date: | Thu, 25 Mar 2010 14:06:26 -0400 |
| Delivery-date: | Mon, 29 Mar 2010 10:13:10 -0700 |
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Hi all, I'd like to use xenoprof passive mode on domain-0 to calculate L2 cache missed for each guest domain. I setup oprofile daemon as followed opcontrol --start-daemon --event=LLC_MISSES:4000 --xen=/boot/xen-3.4.2.gz --vmlinux=/scratch/xen-3.4.2/build-linux-2.6.18-lttng-xen0_x86_32/vmlinux --passive-domains=1,2 --passive-images=/scratch/xen-3.4.0/build-linux-2.6.18-xenU_x86_32/vmlinux,/scratch/xen-3.4.0/build-linux-2.6.18-xenU_x86_32/vmlinux My machine has two cores and I pinned domain-0 to one core and guest domains to the other. When I ran oprofile to calculate cache misses/sec every 5 seconds on domain 0, I noticed that the transient CPU utilization can be as high as 30%. This affects the performance of whatever benchmark I'm running in the guest domain. Is this 30% overhead for domain-0 common or am I doing something obviously wrong? Any suggestion is appreciated. Thank you, Ya-Yunn _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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