On Mon, 2015-06-22 at 09:30 +0200, Ingo Molnar wrote: > Linus, > > Please pull the latest locking-core-for-linus git tree from: > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git > locking-core-for-linus > > # HEAD: 68722101ec3a0e179408a13708dd020e04f54aab locking/lockdep: Remove > hard coded array size dependency > > The main changes are: > > - 'qspinlock' support, enabled on x86: queued spinlocks - these are now the > spinlock variant used by x86 as they outperform ticket spinlocks in every > category. (Waiman Long)
Very interesting. While rebasing http://www.kernelhub.org/?msg=737214&p=2 I found that indeed qspinlock improved the scalability issue by a big factor. linux-4.1 lpaa23:~# pipebench -n 16 threads:16 sleep:30 pinned:1 total operations: 6977349, ops/sec 232578 6977349 lpaa23:~# pipebench -n 16 threads:16 sleep:30 pinned:1 total operations: 7326280, ops/sec 244209 7326280 Current Linus tree : lpaa23:~# pipebench -n 16 threads:16 sleep:30 pinned:1 total operations: 15640802, ops/sec 521360 15640802 lpaa23:~# pipebench -n 16 threads:16 sleep:30 pinned:1 total operations: 15045022, ops/sec 501500 15045022 Adding fd_install() patch then : lpaa23:~# pipebench -n 16 threads:16 sleep:30 pinned:1 total operations: 21471043, ops/sec 715701 21471043 lpaa23:~# pipebench -n 16 threads:16 sleep:30 pinned:1 total operations: 21068501, ops/sec 702283 21068501 -- 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/
