> > In fact it's the cr3 switch (movl %0, %%cr3) that accounts for about 30%
> > of the context switch cost. On x86. On other architectures it's often
> > much, much cheaper.
>
> TLB flushes are expensive everywhere, and you know exactly this and if you
Not every processor is dumb enough to have TLB flush on a context switch.
If you have tags on your tlb/caches it's not a problem.
> Again, the history of our UP scheduler thought us that noone has been able
> to makes it suffer with realistic/high not-stupid-benchamrks loads.
Apache under load, DB2, Postgresql, Lotus domino all show bad behaviour.
(Whether apache, db2, and postgresql want fixing differently is a seperate
argument)
Alan
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Mon Jan 07 2002 - 21:00:29 EST