On 04/02/2014 10:32 AM, Konrad Rzeszutek Wilk wrote:
On Wed, Apr 02, 2014 at 09:27:29AM -0400, Waiman Long wrote:N.B. Sorry for the duplicate. This patch series were resent as the original one was rejected by the vger.kernel.org list server due to long header. There is no change in content.v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable unfair lock. - Reduce unfair lock slowpath lock stealing frequency depending on its distance from the queue head. - Add performance data for IvyBridge-EX CPU.FYI, your v7 patch with 32 VCPUs (on a 32 cpu socket machine) on an HVM guest under Xen after a while stops working. The workload is doing 'make -j32' on the Linux kernel. Completely unresponsive. Thoughts?
Thank for reporting that. I haven't done that much testing on Xen. My focus was in KVM. I will perform more test on Xen to see if I can reproduce the problem.
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