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On 2017/11/14 15:12, Wanpeng Li wrote: > 2017-11-14 15:02 GMT+08:00 Quan Xu <quan.xu0 at gmail.com>: >> >> On 2017/11/13 18:53, Juergen Gross wrote: >>> On 13/11/17 11:06, Quan Xu wrote: >>>> From: Quan Xu <quan.xu0 at gmail.com> >>>> >>>> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called >>&...

On 2017/11/14 15:12, Wanpeng Li wrote: > 2017-11-14 15:02 GMT+08:00 Quan Xu <quan.xu0 at gmail.com>: >> >> On 2017/11/13 18:53, Juergen Gross wrote: >>> On 13/11/17 11:06, Quan Xu wrote: >>>> From: Quan Xu <quan.xu0 at gmail.com> >>>> >>>> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called >>&...

From: Quan Xu <quan.xu0 at gmail.com> To reduce the cost of poll, we introduce three sysctl to control the poll time when running as a virtual machine with paravirt. Signed-off-by: Yang Zhang <yang.zhang.wz at gmail.com> Signed-off-by: Quan Xu <quan.xu0 at gmail.com> --- Documentation/sysctl/kernel.txt |...

From: Quan Xu <quan.xu0 at gmail.com> To reduce the cost of poll, we introduce three sysctl to control the poll time when running as a virtual machine with paravirt. Signed-off-by: Yang Zhang <yang.zhang.wz at gmail.com> Signed-off-by: Quan Xu <quan.xu0 at gmail.com> --- Documentation/sysctl/kernel.txt |...

On 2017/11/13 18:53, Juergen Gross wrote: > On 13/11/17 11:06, Quan Xu wrote: >> From: Quan Xu <quan.xu0 at gmail.com> >> >> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called >> in idle path which will poll for a while before we enter the real idle >> state. >> >> In virtualization, idle path includes several heavy operations >> includes...

On 2017/11/13 18:53, Juergen Gross wrote: > On 13/11/17 11:06, Quan Xu wrote: >> From: Quan Xu <quan.xu0 at gmail.com> >> >> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called >> in idle path which will poll for a while before we enter the real idle >> state. >> >> In virtualization, idle path includes several heavy operations >> includes...

On 2017/11/13 23:08, Ingo Molnar wrote: > * Quan Xu <quan.xu04 at gmail.com> wrote: > >> From: Quan Xu <quan.xu0 at gmail.com> >> >> To reduce the cost of poll, we introduce three sysctl to control the >> poll time when running as a virtual machine with paravirt. >> >> Signed-off-by: Yang Zhang <yang.zhang.wz...

On 2017/11/13 23:08, Ingo Molnar wrote: > * Quan Xu <quan.xu04 at gmail.com> wrote: > >> From: Quan Xu <quan.xu0 at gmail.com> >> >> To reduce the cost of poll, we introduce three sysctl to control the >> poll time when running as a virtual machine with paravirt. >> >> Signed-off-by: Yang Zhang <yang.zhang.wz...

From: Quan Xu <quan.xu0 at gmail.com> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called in idle path which will poll for a while before we enter the real idle state. In virtualization, idle path includes several heavy operations includes timer access(LAPIC timer or TSC deadline timer) which will h...

2017-11-14 16:15 GMT+08:00 Quan Xu <quan.xu0 at gmail.com>: > > > On 2017/11/14 15:12, Wanpeng Li wrote: >> >> 2017-11-14 15:02 GMT+08:00 Quan Xu <quan.xu0 at gmail.com>: >>> >>> >>> On 2017/11/13 18:53, Juergen Gross wrote: >>>> >>>> On 13/11/17 11:06, Quan Xu w...

* Quan Xu <quan.xu0 at gmail.com> wrote: > > > On 2017/11/13 23:08, Ingo Molnar wrote: > > * Quan Xu <quan.xu04 at gmail.com> wrote: > > > > > From: Quan Xu <quan.xu0 at gmail.com> > > > > > > To reduce the cost of poll, we introduce three sysctl to c...

2017-11-14 15:02 GMT+08:00 Quan Xu <quan.xu0 at gmail.com>: > > > On 2017/11/13 18:53, Juergen Gross wrote: >> >> On 13/11/17 11:06, Quan Xu wrote: >>> >>> From: Quan Xu <quan.xu0 at gmail.com> >>> >>> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called >&g...

On 2017/11/14 15:30, Juergen Gross wrote: > On 14/11/17 08:02, Quan Xu wrote: >> >> On 2017/11/13 18:53, Juergen Gross wrote: >>> On 13/11/17 11:06, Quan Xu wrote: >>>> From: Quan Xu <quan.xu0 at gmail.com> >>>> >>>> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called >>>> in idle path which will poll for a while before we enter the real idle >>>> state. >>>> >>>> In virtualization, idle path inc...

On 2017/11/14 15:30, Juergen Gross wrote: > On 14/11/17 08:02, Quan Xu wrote: >> >> On 2017/11/13 18:53, Juergen Gross wrote: >>> On 13/11/17 11:06, Quan Xu wrote: >>>> From: Quan Xu <quan.xu0 at gmail.com> >>>> >>>> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called >>>> in idle path which will poll for a while before we enter the real idle >>>> state. >>>> >>>> In virtualization, idle path inc...

From: Yang Zhang <yang.zhang.wz at gmail.com> Some latency-intensive workload have seen obviously performance drop when running inside VM. The main reason is that the overhead is amplified when running inside VM. The most cost I have seen is inside idle path. This patch introduces a new mechanism to poll for a while before entering idle state. If schedule is needed during poll, then we

From: Yang Zhang <yang.zhang.wz at gmail.com> Some latency-intensive workload have seen obviously performance drop when running inside VM. The main reason is that the overhead is amplified when running inside VM. The most cost I have seen is inside idle path. This patch introduces a new mechanism to poll for a while before entering idle state. If schedule is needed during poll, then we

...14/11/17 10:38, Quan Xu wrote: >> >> On 2017/11/14 15:30, Juergen Gross wrote: >>> On 14/11/17 08:02, Quan Xu wrote: >>>> On 2017/11/13 18:53, Juergen Gross wrote: >>>>> On 13/11/17 11:06, Quan Xu wrote: >>>>>> From: Quan Xu <quan.xu0 at gmail.com> >>>>>> >>>>>> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called >>>>>> in idle path which will poll for a while before we enter the real idle >>>>>> state. >>>>>> >>&...

...14/11/17 10:38, Quan Xu wrote: >> >> On 2017/11/14 15:30, Juergen Gross wrote: >>> On 14/11/17 08:02, Quan Xu wrote: >>>> On 2017/11/13 18:53, Juergen Gross wrote: >>>>> On 13/11/17 11:06, Quan Xu wrote: >>>>>> From: Quan Xu <quan.xu0 at gmail.com> >>>>>> >>>>>> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called >>>>>> in idle path which will poll for a while before we enter the real idle >>>>>> state. >>>>>> >>&...

On 13/11/17 11:06, Quan Xu wrote: > From: Quan Xu <quan.xu0 at gmail.com> > > So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called > in idle path which will poll for a while before we enter the real idle > state. > > In virtualization, idle path includes several heavy operations > includes timer access(LAPIC timer...

* Quan Xu <quan.xu04 at gmail.com> wrote: > From: Quan Xu <quan.xu0 at gmail.com> > > To reduce the cost of poll, we introduce three sysctl to control the > poll time when running as a virtual machine with paravirt. > > Signed-off-by: Yang Zhang <yang.zhang.wz at gmail.com> > Sig...