From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Thu, 25 Mar 2004 19:41:53 +0000 Subject: should ia64_spinlock_contention do backoff? Message-Id: <200403251941.i2PJfrTH026392@napali.hpl.hp.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Has anyone studied the impact of doing exponential backoff in ia64_spinlock_contention. My theory is that it wouldn't buy much _if_ spinlocks always were in their own cachelines, but since they're not, not using backoff could cause extra cache-line bouncing. To be honest, I'd rather not spend time on this myself, since I don't have convenient access to large machines, but me thinks this is a question that's long overdue to have a proper answer. --david