Re: Read/Write NFS I/O performance degraded by FLUSH_STABLE page flushing

Trond Myklebust
2009-05-29T23:13:15Z

On Fri, 2009-05-29 at 19:02 -0400, Brian R Cowan wrote:
> If you can explain how pulling that ONE change can cause the performance
> issue to essentially disappear, I'd be more than happy to *try* to get a
> 2.6.30 test environment configured. Getting ClearCase to *install* on
> kernel.org kernels is a non-trivial operation, requiring modifications to
> install scripts, module makefiles, etc. Then there is the issue of
> verifying that nothing else is impacted, all before I can begin to do this
> test. We're talking days here.
>
> To be blunt, I'd need something I can take to a manager who will ask me
> why I'm spending so much time on an issue when we "already have the
> cause."

It's simple: you are the one asking for a change to the established
kernel behaviour, so you get to justify that change. Saying "it breaks
clearcase on RHEL-5" is not a justification, and I won't accept to ack
the change.

Trond