On 06/25/2014 05:11 AM, coperd wrote: [please don't top-post on technical lists]
> Command line "virsh domblkstat $vmname vda” get the results below: > vda rd_bytes 639415808 > vda wr_bytes 728186880 > > Command line "cat /proc/4438/io” get the result below: > read_bytes: 772415488 > write_bytes: 734040064 Bear in mind that for some file formats, such as qcow2, qemu must read (and write) additional I/O to manage the metadata of the file in comparison to the amount of read and writes performed on behalf of the guest; the qemu numbers are reported from the guest perspective, not what qemu asked the host kernel to do. So seeing /proc/NN/io have larger numbers than qemu makes total sense. I'm still not clear how you are getting vcpu PID numbers for reading from /proc; it's not something that libvirt is currently advertising. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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