Le vendredi 24 août 2012 à 09:48 -0500, Nathan Zimmer a écrit : > On Wed, Aug 22, 2012 at 11:42:58PM +0200, Eric Dumazet wrote: > > On Wed, 2012-08-22 at 20:28 +0200, Eric Dumazet wrote: > > > > > > > > Thats interesting, but if you really want this to fly, one RCU > > > conversion would be much better ;) > > > > > > pde_users would be an atomic_t and you would avoid the spinlock > > > contention. > > > > Here is what I had in mind, I would be interested to know how it helps a 512 core machine ;) > > > > Here are the results and they look great. > > cpuinfo baseline moved kfree Rcu > tasks read-sec read-sec read-sec > 1 0.0141 0.0141 0.0141 > 2 0.0140 0.0140 0.0142 > 4 0.0140 0.0141 0.0141 > 8 0.0145 0.0145 0.0140 > 16 0.0553 0.0548 0.0168 > 32 0.1688 0.1622 0.0549 > 64 0.5017 0.3856 0.1690 > 128 1.7005 0.9710 0.5038 > 256 5.2513 2.6519 2.0804 > 512 8.0529 6.2976 3.0162 > > > Indeed... Could you explicit the test you are actually doing ? Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
