From: Eduardo Habkost <ehabkost@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org,
Richard Henderson <rth@twiddle.net>
Subject: Re: [PATCH v6 1/2] kvm: support -overcommit cpu-pm=on|off
Date: Wed, 27 Jun 2018 10:43:35 -0300 [thread overview]
Message-ID: <20180627134335.GC914@localhost.localdomain> (raw)
In-Reply-To: <20180622192148.178309-2-mst@redhat.com>
On Fri, Jun 22, 2018 at 10:22:05PM +0300, Michael S. Tsirkin wrote:
> With this flag, kvm allows guest to control host CPU power state. This
> increases latency for other processes using same host CPU in an
> unpredictable way, but if decreases idle entry/exit times for the
> running VCPU, so to use it QEMU needs a hint about whether host CPU is
> overcommitted, hence the flag name.
>
> Follow-up patches will expose this capability to guest
> (using mwait leaf).
>
> Based on a patch by Wanpeng Li <kernellwp@gmail.com> .
>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
--
Eduardo
WARNING: multiple messages have this Message-ID (diff)
From: Eduardo Habkost <ehabkost@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: qemu-devel@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
kvm@vger.kernel.org, Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH v6 1/2] kvm: support -overcommit cpu-pm=on|off
Date: Wed, 27 Jun 2018 10:43:35 -0300 [thread overview]
Message-ID: <20180627134335.GC914@localhost.localdomain> (raw)
In-Reply-To: <20180622192148.178309-2-mst@redhat.com>
On Fri, Jun 22, 2018 at 10:22:05PM +0300, Michael S. Tsirkin wrote:
> With this flag, kvm allows guest to control host CPU power state. This
> increases latency for other processes using same host CPU in an
> unpredictable way, but if decreases idle entry/exit times for the
> running VCPU, so to use it QEMU needs a hint about whether host CPU is
> overcommitted, hence the flag name.
>
> Follow-up patches will expose this capability to guest
> (using mwait leaf).
>
> Based on a patch by Wanpeng Li <kernellwp@gmail.com> .
>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
--
Eduardo
next prev parent reply other threads:[~2018-06-27 13:43 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-22 19:22 [PATCH v6 0/2] kvm: limited x86 CPU power management Michael S. Tsirkin
2018-06-22 19:22 ` [Qemu-devel] " Michael S. Tsirkin
2018-06-22 19:22 ` [PATCH v6 1/2] kvm: support -overcommit cpu-pm=on|off Michael S. Tsirkin
2018-06-22 19:22 ` [Qemu-devel] " Michael S. Tsirkin
2018-06-25 9:40 ` Igor Mammedov
2018-06-25 9:40 ` [Qemu-devel] " Igor Mammedov
2018-06-26 14:06 ` Michael S. Tsirkin
2018-06-26 14:06 ` [Qemu-devel] " Michael S. Tsirkin
2018-06-26 15:13 ` Igor Mammedov
2018-06-26 15:13 ` [Qemu-devel] " Igor Mammedov
2018-06-26 15:16 ` Michael S. Tsirkin
2018-06-26 15:16 ` [Qemu-devel] " Michael S. Tsirkin
2018-06-27 13:42 ` Eduardo Habkost
2018-06-27 13:42 ` [Qemu-devel] " Eduardo Habkost
2018-06-27 13:43 ` Eduardo Habkost [this message]
2018-06-27 13:43 ` Eduardo Habkost
2018-06-22 19:22 ` [PATCH v6 2/2] i386/cpu: make -cpu host support monitor/mwait Michael S. Tsirkin
2018-06-22 19:22 ` [Qemu-devel] " Michael S. Tsirkin
2018-06-22 21:55 ` [PATCH v6 0/2] kvm: limited x86 CPU power management no-reply
2018-06-22 21:55 ` [Qemu-devel] " no-reply
2018-06-22 22:03 ` no-reply
2018-06-22 22:03 ` [Qemu-devel] " no-reply
2018-06-22 22:16 ` no-reply
2018-06-22 22:16 ` [Qemu-devel] " no-reply
2018-06-27 15:08 ` Paolo Bonzini
2018-06-27 15:08 ` [Qemu-devel] " Paolo Bonzini
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