[OpenAFS] Windows client tuning question

[Jeffrey Altman]

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Mike Polek wrote:
> First, I'd like to start out by saying that since getting some
> serious (paid for) support from Jeff Altman last year for our
> Windows client woes (well ... more like photoshop woes, but they
> weren't interested in fixing the issue), our end-user complaints
> for Windows systems has gone to near zero. Best $$ I ever spent
> on software support. ;-)  Thanks Jeff.
> 
> I currently have an end user claiming that if he does a lot
> of very heavy I/O for a couple days, his client will lock up.
> I have not yet observed this myself. I just became aware of
> it. He's been restarting the client on his own.

If you can get the user to "fs minidump" when the lockup occurs that 
would be very helpful.

Of course, if the user isn't running the most recent client upgrading is 
the first thing that should be done.  The current release is 1.5.33.

> Checking the RX stats for the machines in question, I note that
> the "noPackets" count is non-zero... and I'm curious if there
> is some RX tuning that needs to be done to give the client
> more network resources to deal with the heavy traffic.
> I recently posted about an issue I was having with the linux
> client, and increasing the number of preallocated RX packets
> solved my bottleneck issue there.

Funny thing you should ask about Rx configuration
1.5.33 adds two functions:

1. it turns on Rx Hot Thread support which significantly
    improves the ability of the client to read incoming
    Rx packets off the wire without dropping them.

2. it adds the "RxExtraPackets" registry value which
    performs exactly the same function that the command
    line option does on UNIX.

> I looked in the "Advanced" tab for client configuration,
> but didn't see anything that looked like it could be adjusted
> in a way that would help me out. Any ideas/tips/pointers?

The Client Configuration tool has not been updated with any of the new 
knobs that have been added to the Windows client since I started working 
on it.   I want to completely re-implement the configuration management 
as a MMC add-on.  See 
http://www.secure-endpoints.com/openafs-windows-roadmap.html for 
mock-ups of what I want to build.  Anyone with cash burning a hole in 
their pocket is welcome to fund the work.

Instead you need to read the release notes and review the registry 
options in Appendix A.


Jeffrey Altman

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