Jakub Kicinski <k...@kernel.org> writes:
> On Tue, 1 Dec 2020 20:53:24 -0800 Vinicius Costa Gomes wrote:
>> Expose the Frame Preemption counters, so the number of
>> express/preemptible packets can be monitored by userspace.
>>
>> These registers are cleared when read, so the value shown is the
>> number of events that happened since the last read.
>>
>> Signed-off-by: Vinicius Costa Gomes <vinicius.go...@intel.com>
>
> You mean expose in a register dump? That's not great user experience..
I can agree with that, even after some formatting on the ethtool side:
Preemption statistics:
TX Preemption event counter: 14070
Good TX Preemptable Packets: 201957
Good TX Express Packets: 32031
TX Preempted Packets: 13259
RX Preemption event counter: 0
Good RX Preemptable Packets: 0
Good RX Preempted Packets: 0
Preemption Exception Counter:
OOO_SMDC 0
OOO_FRAME 0
OOO_FRAG 0
MISS_FRAME_FRAG 0
It's less than ideal, but useful for development/debugging.
>
> Are there any stats that the standards mandate?
I just took abother look at the standard, mainly at the MIBs, there are
no statistics related to frame preemption that I could find, only
configuration stuff.
>
> It'd be great if we could come up with some common set and expose them
> via ethtool like the pause frame statistics.
Agreed, will drop this patch, until this common set is agreed upon.
Cheers,
--
Vinicius
