Hi,
I'd like to resurrect this thread:
https://www.redhat.com/archives/libvir-list/2017-February/msg01084.html
Recent benchmarks have demonstrated that using large values for
poll-max-ns significantly decreases the perceived latency in the Guest,
at the expense of the iothread using more CPU:
On Tue, Feb 21, 2017 at 1:39 PM, Pavel Hrdina wrote:
> On Tue, Feb 21, 2017 at 01:26:25PM +, Daniel P. Berrange wrote:
>> On Tue, Feb 21, 2017 at 02:14:44PM +0100, Pavel Hrdina wrote:
>> > On Tue, Feb 21, 2017 at 12:55:51PM +, Daniel P. Berrange wrote:
>> > > On Tue, Feb 21, 2017 at 01:48:
On Tue, Feb 21, 2017 at 01:26:25PM +, Daniel P. Berrange wrote:
> On Tue, Feb 21, 2017 at 02:14:44PM +0100, Pavel Hrdina wrote:
> > On Tue, Feb 21, 2017 at 12:55:51PM +, Daniel P. Berrange wrote:
> > > On Tue, Feb 21, 2017 at 01:48:15PM +0100, Pavel Hrdina wrote:
> > > > On Tue, Feb 21, 201
On Tue, Feb 21, 2017 at 02:14:44PM +0100, Pavel Hrdina wrote:
> On Tue, Feb 21, 2017 at 12:55:51PM +, Daniel P. Berrange wrote:
> > On Tue, Feb 21, 2017 at 01:48:15PM +0100, Pavel Hrdina wrote:
> > > On Tue, Feb 21, 2017 at 12:26:02PM +, Daniel P. Berrange wrote:
> > > > On Tue, Feb 21, 201
On Tue, Feb 21, 2017 at 12:55:51PM +, Daniel P. Berrange wrote:
> On Tue, Feb 21, 2017 at 01:48:15PM +0100, Pavel Hrdina wrote:
> > On Tue, Feb 21, 2017 at 12:26:02PM +, Daniel P. Berrange wrote:
> > > On Tue, Feb 21, 2017 at 01:14:57PM +0100, Pavel Hrdina wrote:
> > > > QEMU 2.9.0 will int
On Tue, Feb 21, 2017 at 01:48:15PM +0100, Pavel Hrdina wrote:
> On Tue, Feb 21, 2017 at 12:26:02PM +, Daniel P. Berrange wrote:
> > On Tue, Feb 21, 2017 at 01:14:57PM +0100, Pavel Hrdina wrote:
> > > QEMU 2.9.0 will introduce polling feature for AioContext that instead
> > > of blocking syscall
On Tue, Feb 21, 2017 at 12:26:02PM +, Daniel P. Berrange wrote:
> On Tue, Feb 21, 2017 at 01:14:57PM +0100, Pavel Hrdina wrote:
> > QEMU 2.9.0 will introduce polling feature for AioContext that instead
> > of blocking syscalls polls for events without blocking. This means
> > that polling can
On Tue, Feb 21, 2017 at 01:14:57PM +0100, Pavel Hrdina wrote:
> QEMU 2.9.0 will introduce polling feature for AioContext that instead
> of blocking syscalls polls for events without blocking. This means
> that polling can be in most cases faster but it also increases CPU
> utilization.
>
> To add
QEMU 2.9.0 will introduce polling feature for AioContext that instead
of blocking syscalls polls for events without blocking. This means
that polling can be in most cases faster but it also increases CPU
utilization.
To address this issue QEMU implements self-tuning algorithm that
modifies the cu