search for: pravirt_spinlock

...patch with > the following results: > > Overall we are seeing good improvement for pv-unfair version. > > System: 32 cpu sandybridge with HT on (4 node with 32 GB each) > Guest : 8GB with 16 vcpu/VM. > Average was taken over 8-10 data points. > > Base = 3.15-rc2 with PRAVIRT_SPINLOCK = y > > A = 3.15-rc2 + qspinlock v9 patch with QUEUE_SPINLOCK = y > PRAVIRT_SPINLOCK = y PARAVIRT_UNFAIR_LOCKS = y (unfair lock) > > B = 3.15-rc2 + qspinlock v9 patch with QUEUE_SPINLOCK = y > PRAVIRT_SPINLOCK = n PARAVIRT_UNFAIR_LOCKS = n > (queue spinlock without paravirt)...

...patch with > the following results: > > Overall we are seeing good improvement for pv-unfair version. > > System: 32 cpu sandybridge with HT on (4 node with 32 GB each) > Guest : 8GB with 16 vcpu/VM. > Average was taken over 8-10 data points. > > Base = 3.15-rc2 with PRAVIRT_SPINLOCK = y > > A = 3.15-rc2 + qspinlock v9 patch with QUEUE_SPINLOCK = y > PRAVIRT_SPINLOCK = y PARAVIRT_UNFAIR_LOCKS = y (unfair lock) > > B = 3.15-rc2 + qspinlock v9 patch with QUEUE_SPINLOCK = y > PRAVIRT_SPINLOCK = n PARAVIRT_UNFAIR_LOCKS = n > (queue spinlock without paravirt)...

...hangs. I was able to do some performance testing. here are the results: Overall we are seeing good improvement for pv-unfair version. System : 32 cpu sandybridge with HT on. (4 node machine with 32 GB each) Guest: 8GB with 16 vcpu/VM. Average was taken over 8-10 data points. Base = 3.15-rc2 with PRAVIRT_SPINLOCK = y A = 3.15-rc2 + qspinlock v9 patch with QUEUE_SPINLOCK = y PRAVIRT_SPINLOCK = y PARAVIRT_UNFAIR_LOCKS = y (unfair lock) B = 3.15-rc2 + qspinlock v9 patch with QUEUE_SPINLOCK = y PRAVIRT_SPINLOCK = n PARAVIRT_UNFAIR_LOCKS = n (queue spinlock without paravirt) C = 3.15-rc2 + qspinlock v9 patch...

...KT had done some performance testing on this patch with the following results: Overall we are seeing good improvement for pv-unfair version. System: 32 cpu sandybridge with HT on (4 node with 32 GB each) Guest : 8GB with 16 vcpu/VM. Average was taken over 8-10 data points. Base = 3.15-rc2 with PRAVIRT_SPINLOCK = y A = 3.15-rc2 + qspinlock v9 patch with QUEUE_SPINLOCK = y PRAVIRT_SPINLOCK = y PARAVIRT_UNFAIR_LOCKS = y (unfair lock) B = 3.15-rc2 + qspinlock v9 patch with QUEUE_SPINLOCK = y PRAVIRT_SPINLOCK = n PARAVIRT_UNFAIR_LOCKS = n (queue spinlock without paravirt) C = 3.15-rc2 + qspinlock v9 patch...

v8->v9: - Integrate PeterZ's version of the queue spinlock patch with some modification: http://lkml.kernel.org/r/20140310154236.038181843 at infradead.org - Break the more complex patches into smaller ones to ease review effort. - Fix a racing condition in the PV qspinlock code. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving

v8->v9: - Integrate PeterZ's version of the queue spinlock patch with some modification: http://lkml.kernel.org/r/20140310154236.038181843 at infradead.org - Break the more complex patches into smaller ones to ease review effort. - Fix a racing condition in the PV qspinlock code. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving

v9->v10: - Make some minor changes to qspinlock.c to accommodate review feedback. - Change author to PeterZ for 2 of the patches. - Include Raghavendra KT's test results in patch 18. v8->v9: - Integrate PeterZ's version of the queue spinlock patch with some modification: http://lkml.kernel.org/r/20140310154236.038181843 at infradead.org - Break the more complex

v9->v10: - Make some minor changes to qspinlock.c to accommodate review feedback. - Change author to PeterZ for 2 of the patches. - Include Raghavendra KT's test results in patch 18. v8->v9: - Integrate PeterZ's version of the queue spinlock patch with some modification: http://lkml.kernel.org/r/20140310154236.038181843 at infradead.org - Break the more complex