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docs: virsh: Add minimal documentation for 'mbmt' and 'mbml' perf events

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Peter Krempa 2016-06-17 10:20:45 +02:00
parent 5a9221b9af
commit 3110363d06
1 changed files with 13 additions and 4 deletions
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tools/virsh.pod
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@ -900,7 +900,9 @@ I<--interface> returns:
"net.<num>.tx.drop" - number of transmit packets dropped
I<--perf> returns the statistics of all enabled perf events:
"perf.cache" - the cache usage in Byte currently used
"perf.cmt" - the cache usage in Byte currently used
"perf.mbmt" - total system bandwidth from one level of cache
"perf.mbml" - bandwidth of memory traffic for a memory controller
I<--block> returns information about disks associated with each
domain. Using the I<--backing> flag extends this information to
@ -2180,9 +2182,16 @@ from different sources can be supported by perf.
Currently only QEMU/KVM supports this command. The I<--enable> and I<--disable>
option combined with B<eventSpec> can be used to enabled or disable specific
performance event. B<eventSpec> is a string list of one or more events
separated by commas. However, just "cmt" event is supported presently. CMT is a
PQos (Platform Qos) feature to monitor the usage of cache by applications
running on the platform.
separated by commas. Valid event names are "cmt", "mbmt", "mbml".
CMT is a PQos (Platform Qos) feature to monitor the usage of cache by
applications running on the platform.
MBM (Memory Bandwidth Monitoring) provides a way to monitor the Total
system memory bandwidth between one level of cache and another (mbmt)
and the amount of data (bytes/s) sent through the memory controller on
the socket (mbml).
The statistics can be retrieved using the B<domstats> command using the
I<--perf> flag.
If I<--live> is specified, affect a running guest.
If I<--config> is specified, affect the next boot of a persistent guest.