On 07/17/2012 02:39 PM, Raghavendra K T wrote:
[...]
But
if vcpu A is spinning for x% of its time and processing on the other,
then vcpu B will flip its dy_eligible for those x%, and not flip it when
it's processing. I don't understand how this is useful.
Suppose A is doing really good job an
On 07/17/2012 01:59 PM, Avi Kivity wrote:
On 07/16/2012 07:10 PM, Rik van Riel wrote:
On 07/16/2012 06:07 AM, Avi Kivity wrote:
+{
+bool eligible;
+
+eligible = !vcpu->ple.cpu_relax_intercepted ||
+(vcpu->ple.cpu_relax_intercepted&&
+ vcpu->ple.dy_eligible);
+
+
On 07/16/2012 07:10 PM, Rik van Riel wrote:
> On 07/16/2012 06:07 AM, Avi Kivity wrote:
>
>>> +{
>>> +bool eligible;
>>> +
>>> +eligible = !vcpu->ple.cpu_relax_intercepted ||
>>> +(vcpu->ple.cpu_relax_intercepted&&
>>> + vcpu->ple.dy_eligible);
>>> +
>>> +if (vc
On 07/16/2012 03:37 PM, Avi Kivity wrote:
On 07/16/2012 11:25 AM, Raghavendra K T wrote:
From: Raghavendra K T
Currently, on a large vcpu guests, there is a high probability of
yielding to the same vcpu who had recently done a pause-loop exit or
cpu relax intercepted. Such a yield can lead to t
On 07/16/2012 09:40 PM, Rik van Riel wrote:
On 07/16/2012 06:07 AM, Avi Kivity wrote:
+{
+ bool eligible;
+
+ eligible = !vcpu->ple.cpu_relax_intercepted ||
+ (vcpu->ple.cpu_relax_intercepted&&
+ vcpu->ple.dy_eligible);
+
+ if (vcpu->ple.cpu_relax_intercepted)
+ vcpu->ple.dy_eligible = !vcpu->p
On 07/16/2012 06:07 AM, Avi Kivity wrote:
+{
+ bool eligible;
+
+ eligible = !vcpu->ple.cpu_relax_intercepted ||
+ (vcpu->ple.cpu_relax_intercepted&&
+vcpu->ple.dy_eligible);
+
+ if (vcpu->ple.cpu_relax_intercepted)
+
On 07/16/2012 11:25 AM, Raghavendra K T wrote:
> From: Raghavendra K T
>
> Currently, on a large vcpu guests, there is a high probability of
> yielding to the same vcpu who had recently done a pause-loop exit or
> cpu relax intercepted. Such a yield can lead to the vcpu spinning
> again and hence
From: Raghavendra K T
Currently, on a large vcpu guests, there is a high probability of
yielding to the same vcpu who had recently done a pause-loop exit or
cpu relax intercepted. Such a yield can lead to the vcpu spinning
again and hence degrade the performance.
The patchset keeps track of the
