On 01/08/19 14:57, Dario Faggioli wrote:
> Can't we achieve this by removing SD_WAKE_AFFINE from the relevant
> scheduling domains? By acting on
> /proc/sys/kernel/sched_domain/cpuX/domainY/flags, I mean?
>
> Of course this will impact all tasks, not only KVM vcpus. But if the
> host does KVM
Dario Faggioli writes:
> On Tue, 2019-07-30 at 17:33 +0800, Wanpeng Li wrote:
>> However, in multiple VMs over-subscribe virtualization scenario, it
>> increases
>> the probability to incur vCPU stacking which means that the sibling
>> vCPUs from
>> the same VM will be stacked on one pCPU. I
On Thu, 1 Aug 2019 at 20:57, Dario Faggioli wrote:
>
> On Tue, 2019-07-30 at 17:33 +0800, Wanpeng Li wrote:
> > However, in multiple VMs over-subscribe virtualization scenario, it
> > increases
> > the probability to incur vCPU stacking which means that the sibling
> > vCPUs from
> > the same VM
On Tue, 2019-07-30 at 17:33 +0800, Wanpeng Li wrote:
> However, in multiple VMs over-subscribe virtualization scenario, it
> increases
> the probability to incur vCPU stacking which means that the sibling
> vCPUs from
> the same VM will be stacked on one pCPU. I test three 80 vCPUs VMs
> running
On Tue, 2019-07-30 at 13:46 +0200, Paolo Bonzini wrote:
> On 30/07/19 11:33, Wanpeng Li wrote:
> > When qemu/other vCPU inject virtual interrupt to guest through
> > waking up one
> > sleeping vCPU, it increases the probability to stack vCPUs/qemu by
> > scheduler
> > wake-affine. vCPU stacking
On Tue, Jul 30, 2019 at 05:33:55PM +0800, Wanpeng Li wrote:
> From: Wanpeng Li
>
> Wake-affine is a feature inside scheduler which we attempt to make processes
> running closely, it gains benefit mostly from cache-hit. When waker tries
> to wakup wakee, it needs to select cpu to run wakee,
On 30/07/19 11:33, Wanpeng Li wrote:
> When qemu/other vCPU inject virtual interrupt to guest through waking up one
> sleeping vCPU, it increases the probability to stack vCPUs/qemu by scheduler
> wake-affine. vCPU stacking issue can greately inceases the lock
> synchronization
> latency in a
From: Wanpeng Li
Wake-affine is a feature inside scheduler which we attempt to make processes
running closely, it gains benefit mostly from cache-hit. When waker tries
to wakup wakee, it needs to select cpu to run wakee, wake affine heuristic
mays select the cpu which waker is running on
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