Re: [PATCH v3 4/6] powerpc/64s: implement queued spinlocks and rwlocks

2020-07-23 Thread Michal Suchánek
On Mon, Jul 06, 2020 at 02:35:38PM +1000, Nicholas Piggin wrote: > These have shown significantly improved performance and fairness when > spinlock contention is moderate to high on very large systems. > > [ Numbers hopefully forthcoming after more testing, but initial >results look good ] >

Re: [PATCH v3 4/6] powerpc/64s: implement queued spinlocks and rwlocks

2020-07-09 Thread Peter Zijlstra
On Thu, Jul 09, 2020 at 08:20:25PM +1000, Michael Ellerman wrote: > Nicholas Piggin writes: > > These have shown significantly improved performance and fairness when > > spinlock contention is moderate to high on very large systems. > > > > [ Numbers hopefully forthcoming after more testing, but

Re: [PATCH v3 4/6] powerpc/64s: implement queued spinlocks and rwlocks

2020-07-09 Thread Michael Ellerman
Nicholas Piggin writes: > These have shown significantly improved performance and fairness when > spinlock contention is moderate to high on very large systems. > > [ Numbers hopefully forthcoming after more testing, but initial >results look good ] Would be good to have something here, even

[PATCH v3 4/6] powerpc/64s: implement queued spinlocks and rwlocks

2020-07-05 Thread Nicholas Piggin
These have shown significantly improved performance and fairness when spinlock contention is moderate to high on very large systems. [ Numbers hopefully forthcoming after more testing, but initial results look good ] Thanks to the fast path, single threaded performance is not noticably hurt.