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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