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> > 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/ | ||||||||||||
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