Messages in this thread | | | Subject | Re: [patch 4/4] powerpc 2.6.21-rt1: reduce scheduling latency by changing tlb flush size | From | Benjamin Herrenschmidt <> | Date | Tue, 15 May 2007 17:38:27 +1000 |
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> + > +#ifdef CONFIG_PREEMPT_RT > + /* > + * Since flushing tlb needs expensive hypervisor call(s) on celleb, > + * always flush it on RT to reduce scheduling latency. > + */ > + if (machine_is(celleb)) { > + flush_tlb_pending(); > + return; > + } > +#endif /* CONFIG_PREEMPT_RT */ > + > if (i >= PPC64_TLB_BATCH_NR) > flush_tlb_pending(); > }
Any reason to do that only on celleb ? :-)
Also, we might want to still batch, though in smaller amount. Have you measured the time it takes ? We might want to modulate the amount based on wether we are using native hash tables or an hypervisor.
Ben.
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