Messages in this thread | | | Date | Fri, 26 Jan 2007 12:41:27 -0600 | From | "Chris Friesen" <> | Subject | Re: [RFC] Fair-user scheduler |
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Srivatsa Vaddagiri wrote: > Current Linux CPU scheduler doesnt recognize process aggregates while > allocating bandwidth. As a result of this, an user could simply spawn large > number of processes and get more bandwidth than others. > > Here's a patch that provides fair allocation for all users in a system. > > Some benchmark numbers with and without the patch applied follows: > > > user "vatsa" user "guest" > (make -s -j4 bzImage) (make -s -j20 bzImage) > > 2.6.20-rc5 472.07s (real) 257.48s (real) > 2.6.20-rc5+fairsched 766.74s (real) 766.73s (real)
As Kirill brought up, why does it take so much more time? Are you thrashing the cache?
> - breaks O(1) (ouch!) > Best way to avoid this is to split runqueue to be per-user and > per-cpu, which I have not implemented to keep the patch simple.
Presumably this would be made generic, as in per-"group" rather than per user?
> - Fairsched aware SMP load balance NOT addressed (yet)
This is kind of important, no?
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