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Ravikiran G Thirumalai wrote: > On Sat, Jan 13, 2007 at 03:39:45PM +1100, Nick Piggin wrote: >>What is the "CS time"? > > > Critical Section :). This is the maximal time interval I measured from > t2 above to the time point we release the spin lock. This is the hold > time I guess. > > >>It would be interesting to know how long the maximal lru_lock *hold* time >>is, >>which could give us a better indication of whether it is a hardware problem. >> >>For example, if the maximum hold time is 10ms, that it might indicate a >>hardware fairness problem. > > > The maximal hold time was about 3s. Well then it doesn't seem very surprising that this could cause a 30s wait time for one CPU in a 16 core system, regardless of fairness. I guess most of the contention, and the lock hold times are coming from vmscan? Do you know exactly which critical sections are the culprits? -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com - 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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