Hi,
I am trying to profiling disk IO caused by page miss in memory inside
a guest OS. Both guest and host OS are Fedora 13.
I am using the linux command sar which provide such number of major faults like
majflt/s:
Number of major faults the system has made per
second, those which have required loading a memory page from disk
Then I started a workloads on both the guest and host OS. As a result,
the guest reports about 1000 majfits, while the host reports only
around 80. So is 1000 majflt is the actual disk IO for that guest? Or
the number of host OS is what I want. Thanks.
- w
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Iain Kay
2011-May-19 22:45 UTC
Re: [Xen-users] disk IO profiling in guest suing sar command
Hey Steven, I''d certainly imagine you need to run the tool on the guest to get an accurate reading. From what I''ve seen of xen boxes dom0 is running like a domU and only reporting loads/usage of the host node itself. Not the guests. I could be wrong, but this is what I make of it. Iain Kay On 18 May 2011, at 21:43, Steven wrote:> Hi, > I am trying to profiling disk IO caused by page miss in memory inside > a guest OS. Both guest and host OS are Fedora 13. > I am using the linux command sar which provide such number of major faults like > > majflt/s: > Number of major faults the system has made per > second, those which have required loading a memory page from disk > > Then I started a workloads on both the guest and host OS. As a result, > the guest reports about 1000 majfits, while the host reports only > around 80. So is 1000 majflt is the actual disk IO for that guest? Or > the number of host OS is what I want. Thanks. > > - w > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users