* xenoprof passive mode overhead
@ 2010-03-25 18:06 Ya-Yunn Su
2010-03-29 17:32 ` Dulloor
0 siblings, 1 reply; 2+ messages in thread
From: Ya-Yunn Su @ 2010-03-25 18:06 UTC (permalink / raw)
To: xen-devel
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: xenoprof passive mode overhead
2010-03-25 18:06 xenoprof passive mode overhead Ya-Yunn Su
@ 2010-03-29 17:32 ` Dulloor
0 siblings, 0 replies; 2+ messages in thread
From: Dulloor @ 2010-03-29 17:32 UTC (permalink / raw)
To: Ya-Yunn Su; +Cc: xen-devel
If you use a very low threshold for triggering events, the overhead
would be more. Looks like thats the case with you.
-dulloor
On Thu, Mar 25, 2010 at 2:06 PM, Ya-Yunn Su <yayunn.su@gmail.com> wrote:
> 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@lists.xensource.com
> http://lists.xensource.com/xen-devel
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-03-29 17:32 ` Dulloor
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