From mboxrd@z Thu Jan 1 00:00:00 1970 From: peterz@infradead.org (Peter Zijlstra) Date: Sat, 7 Apr 2018 11:07:54 +0200 Subject: [PATCH 02/10] locking/qspinlock: Remove unbounded cmpxchg loop from locking slowpath In-Reply-To: References: <1522947547-24081-1-git-send-email-will.deacon@arm.com> <1522947547-24081-3-git-send-email-will.deacon@arm.com> Message-ID: <20180407090754.GP4082@hirez.programming.kicks-ass.net> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Apr 06, 2018 at 04:50:19PM -0400, Waiman Long wrote: > # of threads 4.16 kernel patched 4.16 kernel > ------------ ----------- ------------------- > 1 7,417 kop/s 7,408 kop/s > 2 5,755 kop/s 4,486 kop/s > 3 4,214 kop/s 4,169 kop/s > 4 4,396 kop/s 4,383 kop/s > Interesting, I didn't see that dip in my userspace tests.. I'll have to try again.