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SubjectRe: [PATCH] sched: Fix adverse effects of NFS client on interactive response
Trond Myklebust wrote:
> On Wed, 2005-12-21 at 08:36 -0500, Kyle Moffett wrote:
>
>>On Dec 21, 2005, at 08:21, Trond Myklebust wrote:
>>
>>>...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.
>>
>>Uhh, what part of disk/NFS/filesystem access is "interactive"? Which
>>of those sleeps directly involve responding to user-interface
>>events? _That_ is the whole point of the interactivity bonus, and
>>precisely why Ingo introduced TASK_NONINTERACTIVE sleeps; so that
>>processes that are not being useful for interactivity could be moved
>>away from TASK_NONINTERRUPTABLE, with the end result that the X-
>>server could be run at priority 0 without harming interactivity, even
>>during heavy *disk*, *NFS*, and *network* activity. Admittedly, that
>>may not be what some people want, but they're welcome to turn off the
>>interactivity bonuses via some file in /proc (sorry, don't remember
>>which at the moment).
>
>
> Then have io_schedule() automatically set that flag, and convert NFS to
> use io_schedule(), or something along those lines. I don't want a bunch
> of RT-specific flags littering the NFS/RPC code.

This flag isn't RT-specific. It's used in the scheduling SCHED_NORMAL
tasks and has no other semantic effects.

Peter
--
Peter Williams pwil3058@bigpond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
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