> OK, 200 cycles... > > But what is the cost of the conditional branch you added in prefetch(x) ?
Much less than the tablewalk. On ppc64 a tablewalk of an address that is not populated in the hashtable will incur 2 cacheline lookups (primary and secondary buckets). This plus the MMU state machine overhead adds up. Cue Linus rant about PowerPC MMU :) Anton - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
