No VPNs involved here. I do run AFS over vpn occasionally, but on those
times my response is sufficiently swamped by WAN considerations that I
don't even think about performance. For now I'm talking purely local
response.
Your comment about "predictable round trip times" rings a bell. We're
seeing occasional spikes in ping response time, and feel that that would
be indicative of AFS and general network problems. But I was hoping to
nail something down to, "Here, I found the problem showing up in a
measurable way in AFS!"
Dale
On 01/13/2011 03:51 PM, Neil Davies wrote:
A bone
rxdebug can be used to see either end of the connection (try it with
the host/client addresses and ports reversed).
are there any VPNs involved? that makes fragmentation issues
(especially if links are loaded) and their interaction with "full"
buffers worth looking.
there are plenty of other steps possible after this - timed trace
based analysis for example - but i doubt if those are of particular
interest to the list and they would be more involved.
rx likes predictable round trip times (low variance in delay, low loss
rates) - it is the lack of that I guess you are suffering from.
Neil
On 13 Jan 2011, at 20:24, Dale Pontius wrote:
We're having intermittent network performance problems, and the
primary manifestation to us as users looks like "an OpenAFS
slowdown." I'm wondering if it's possible to collect access time
statistics out of an OpenAFS Linux client. A little time with google
and I see the "-enable_peer_stats" and "-enable_process_stats"
options when starting the client daemon, and this very well may
furnish the information that I need. A subsequent search gets me to
the "rxdebug" document, though that document appears to be
server-centric as opposed to querying the client. Nor does it tell
me what information I can collect or if access time is part of that
information - only mentioning serveral parameters that it does collect.
Can someone toss me a bone here - or a link?
Thanks
Dale Pontius
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Tie-Line: 446-6850
email: [email protected]
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