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xen-devel
RE: [Xen-devel] Regarding TX/RX rings
> Hi All,
>
> I have to monitor the rate of data transfer over a time window for TX/RX rings
> in DOM0 for all DOMUs.
>
> Is there a good place to start with in terms of code ? Any pointers of sample
> implementation already existing for this will be useful.
>
For what purpose?
Why monitor the rings directly rather than monitoring throughput at a level
that already allows such things (disk io / network io etc)?
Would you be monitoring rings slots used or actual data?
There appears to be data available in /sys/devices/vbd-<domid>-<devid> that
might tell you what you want for vbd's (at least there is in 2.6.31.12 - your
kernel might be different). That may correlate directly to rings slots or may
be an abstraction. Vbd only has one ring containing both read and write
requests but the stats seem to break it down.
For network you can find throughput information in the
/sys/devices/vif-<domid>-<devid>/net:vif<domid>.<devid>/statistics (maybe a few
ways to get there) but that seems more packet oriented, and a single packet
doesn't correlate directly to a ring slot - you could have 1 packet taking
several rings slots and for GSO you could have a 'large' packet in one ring
slot that would be broken up into several MTU sized packets. You'd probably
need to implement a similar statistics reporting function in vif like vbd to
tell you what you want to know about the actual rings.
James
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