Re: [PATCH] sched: Fix adverse effects of NFS clienton interactive response

[Trond Myklebust]

On Wed, 2005-12-21 at 17:32 +1100, Peter Williams wrote:

> > Sorry. That theory is just plain wrong. ALL of those case _ARE_
> > interactive sleeps.
> 
> It's not a theory.  It's a result of observing a -j 16 build with the 
> sources on an NFS mounted file system with top with and without the 
> patches and comparing that with the same builds with the sources on a 
> local file system.  Without the patches the tasks in the kernel build 
> all get the same dynamic priority as the X server and other interactive 
> programs when the sources are on an NFS mounted file system.  With the 
> patches they generally have dynamic priorities between 6 to 10 higher 
> than the X server and other interactive programs.

...and if you stick in a faster server?...

There is _NO_ fundamental difference between NFS and a local filesystem
that warrants marking one as "interactive" and the other as
"noninteractive". What you are basically saying is that all I/O should
be marked as TASK_NONINTERACTIVE.

Cheers,
  Trond

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