Re: [PATCH] KVM: LAPIC: Tune lapic_timer_advance_ns automatically

2018-10-08 Thread Wanpeng Li
On Mon, 8 Oct 2018 at 20:04, Liran Alon wrote: > > > > > On 8 Oct 2018, at 13:59, Wanpeng Li wrote: > > > > On Mon, 8 Oct 2018 at 05:02, Liran Alon wrote: > >> > >> > >> > >>> On 28 Sep 2018, at 9:12, Wanpeng Li wrote: > >>> > >>> From: Wanpeng Li > >>> > >>> In cloud environment, lapic_timer_

Re: [PATCH] KVM: LAPIC: Tune lapic_timer_advance_ns automatically

2018-10-08 Thread Liran Alon
> On 8 Oct 2018, at 13:59, Wanpeng Li wrote: > > On Mon, 8 Oct 2018 at 05:02, Liran Alon wrote: >> >> >> >>> On 28 Sep 2018, at 9:12, Wanpeng Li wrote: >>> >>> From: Wanpeng Li >>> >>> In cloud environment, lapic_timer_advance_ns is needed to be tuned for >>> every CPU >>> generations

Re: [PATCH] KVM: LAPIC: Tune lapic_timer_advance_ns automatically

2018-10-08 Thread Wanpeng Li
On Mon, 8 Oct 2018 at 05:02, Liran Alon wrote: > > > > > On 28 Sep 2018, at 9:12, Wanpeng Li wrote: > > > > From: Wanpeng Li > > > > In cloud environment, lapic_timer_advance_ns is needed to be tuned for > > every CPU > > generations, and every host kernel versions(the > > kvm-unit-tests/tscde

Re: [PATCH] KVM: LAPIC: Tune lapic_timer_advance_ns automatically

2018-10-07 Thread Liran Alon
> On 28 Sep 2018, at 9:12, Wanpeng Li wrote: > > From: Wanpeng Li > > In cloud environment, lapic_timer_advance_ns is needed to be tuned for every > CPU > generations, and every host kernel versions(the > kvm-unit-tests/tscdeadline_latency.flat > is 5700 cycles for upstream kernel and 96

Re: [PATCH] KVM: LAPIC: Tune lapic_timer_advance_ns automatically

2018-10-01 Thread Paolo Bonzini
On 28/09/2018 08:12, Wanpeng Li wrote: > From: Wanpeng Li > > In cloud environment, lapic_timer_advance_ns is needed to be tuned for every > CPU > generations, and every host kernel versions(the > kvm-unit-tests/tscdeadline_latency.flat > is 5700 cycles for upstream kernel and 9600 cycles for

[PATCH] KVM: LAPIC: Tune lapic_timer_advance_ns automatically

2018-09-27 Thread Wanpeng Li
From: Wanpeng Li In cloud environment, lapic_timer_advance_ns is needed to be tuned for every CPU generations, and every host kernel versions(the kvm-unit-tests/tscdeadline_latency.flat is 5700 cycles for upstream kernel and 9600 cycles for our 3.10 product kernel, both preemption_timer=N, S