On Feb 12, 2008, at 10:46 PM, Mike Polek wrote:

Hello, all,
 I'm working on some performance tuning using Linux servers with
AFS clients and ftp server software to shuttle data from users
on the net to my AFS file servers. While working on tuning
things for performance and stability, the number one issue
I run into is that if things get "too busy," all the processes
go into a holding pattern where ps axo wchan shows them all
in afs_cv_wait.

  [snip]

 Any tips/pointers? I'm ok with just capping the usage
and declaring the limit to be somewhere below the threshold
where things go horribly wrong. But if there is a way to
get performance to degrade gracefully under a high load,
that would be preferred.

 And if I forgot to post some important vital and
super obvious piece of information... apologies in advance. ;-)

What parameters are you using for the client? What's rxdebug <client> - port 7001 -rxstats show?

--
Mike Garrison

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