On Sun, Mar 20, 2011 at 08:56:52PM +0100, Tejun Heo wrote: > So, here's the patch to implement and use mutex_try_spin(), which > applies the same owner spin logic to try locking. The result looks > pretty good. > > I re-ran all three. DFL is the current custom locking. SIMPLE is > with only the previous patch applied. SPIN is both the previous and > this patches applied. > > USER SYSTEM SIRQ CXTSW THROUGHPUT > DFL 14484 129368 390 1669102 171.955 > SIMPLE 14483 128902 318 1187031 171.512 > SPIN 14311 129222 347 1198166 174.904 > > DFL/SIMPLE results are more or less consistent with the previous run. > SPIN seems to consume a bit more cpu than SIMPLE but shows discernably > better throughput. I'm running SPIN again just in case but the result > seems pretty consistent.
Here's another run. SPIN 14377 129092 335 1189817 172.724 It's not as high as the last run, but given other runs I've been seeing, I think meaningful (ie. not measurement error) throughput advantage exists. That said, the difference definitely seems minor. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
