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SubjectSUNRPC problem with 2.6.26 and beyond
I have a dual quad-core Xeon system running software 
(http://www.unidata.ucar.edu/software/ldm) that relays and processes
weather data through RPC calls, keeping a queue of data in a memory
mapped file. Up until 2.6.26 the system has run just fine (for example
2.6.25.17). But starting with 2.6.26 through 2.6.27.2 the system runs
into a problem after approximately 24 hours. The symptom is that the
processing slows down to a crawl. Using "top" I can see that the System
time is up over 90%, with almost no User and Wait time. If I stop and
restart the software, most of the time it gets better - but sometimes it
takes a reboot to fix the problem. I have an identical system that does
just processing and ingesting data from remote systems, and it does not
have this problem. I have tried a number of different kernel
configurations, but they all show the same problem.

I suspect a problem with SUNRPC. I notice that there were a large
number of SUNRPC patches in 2.6.26. I am looking for suggestions on how
to pin down which patches are causing the problem. Are there ways to
figure where in the kernel the time is being spent? I am will to work
on isolating the problem, but I need some suggestions on the best way to
do it given the large number of SUNRPC patches in 2.6.26 and the fact
that each experiment takes a day.
--

Dr. Harry Edmon E-MAIL: harry@atmos.washington.edu
206-543-0547 harry@washington.edu
Dept of Atmospheric Sciences FAX: 206-543-0308
University of Washington, Box 351640, Seattle, WA 98195-1640



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