[Lustre-discuss] lnet route tracing

[Michael Di Domenico]

is there anything in the lustre software that allows me to
'traceroute' an lnet path? i have a dual gateway setup, I want to
make sure the data is flowing over both gateways from particular
machines
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[liang.whamcloud]

Hi,

cat /proc/sys/lnet/peers can show some helpful information like queued
bytes and router-buffer credits, but these information may not be enough
to confirm realtime data flow. Of course, It's not difficult to make
LNet record information like forwarded bytes on each router.

--
Cheers
Liang

[Isaac Huang]

On Tue, Oct 19, 2010 at 11:05:08AM +0800, liang.whamcloud wrote:
> ......

> to confirm realtime data flow. Of course, It's not difficult to make
> LNet record information like forwarded bytes on each router.

I think it's already recorded - in the second to last field in
"/proc/sys/lnet/stats".

Thanks,
Isaac

[liang.whamcloud]

hmm... I think lnet/stats will record forwarded bytes all together,
but not for each single route. it's probably more helpful If we can
record such information on lnet_route or lnet_peer, how do you think?

Regards
Liang

[liang.whamcloud]

Isaac,

Sorry I haven't made it very clear in previous mail, I mean, current
stat can't show forwarded-bytes from point of view of client/server,
it's aggregation of all nodes connected on router, right?

Liang

On 10/19/10 1:46 PM, Isaac Huang wrote: