[ovs-discuss] Time a packet spends in the switch

[Danish Sattar]

I've tried in datapath.c, bridge.c, learning-switch.c and flow-table.c but
nothing works.
For kernel module i'm using printk() to print the messages and for
userspace simply writing to a file but for some reason nothing happens in
either modules.

Any other ideas that i can try to get the openvswitch per packet processing
time.

Thanks

*Best Regards*
*Danish Sattar*

On Thu, Oct 13, 2016 at 2:24 PM, Danish Sattar <danishsattar at gmail.com>
wrote:

> Thanks. I will give it a shot.
>
> *Best Regards*
> *Danish Sattar*
>
> On Thu, Oct 13, 2016 at 2:15 PM, Ben Pfaff <blp at ovn.org> wrote:
>
>> On Thu, Oct 13, 2016 at 12:27:38PM -0400, Danish Sattar wrote:
>> > I'm trying to find out the time a packet spends in the switch only. Time
>> > difference between packet in and out.
>> >
>> > I thought analyzing the time in learning-switch.c would be give me some
>> > info but that didn't work.
>>
>> Most packets don't ever go to userspace so you'll have to instrument the
>> kernel module, probably the ovs_dp_process_packet() function in
>> datapath/datapath.h.  I don't know the best way to do this.
>>
>> You might be able to approximate this with the Linux "perf" tool.
>>
>
>
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