Srivatsa,
> 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)
1. If I interpret these numbers correctly, then your scheduler is not work-conservative,
i.e. 766.74 + 766.73 >> 472.07 + 257.48
why does it slow down users so much?
2. compilation of kernel is quite CPU-bound task. So it's not that hard to be fair :)
Can you please try some other applications?
e.g. pipe-based context switching, java Volano benchmark etc.
Thanks,
Kirill
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