* [Qemu-devel] Throttle in virtio-net
@ 2016-09-02 15:13 Pradeep Kiruvale
2016-09-05 8:33 ` [Qemu-devel] [Qemu-discuss] " Alberto Garcia
0 siblings, 1 reply; 5+ messages in thread
From: Pradeep Kiruvale @ 2016-09-02 15:13 UTC (permalink / raw)
To: qemu-discuss, qemu-devel
Hi All,
I am planning to implement throttling functionality for virtio-net driver
using the throttling APIs that exist inside qemu.
Please let me know if someone already working on the same. Asking because I
do not want to just replicate the work.
Thanks & Regards,
Pradeep
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] [Qemu-discuss] Throttle in virtio-net
2016-09-02 15:13 [Qemu-devel] Throttle in virtio-net Pradeep Kiruvale
@ 2016-09-05 8:33 ` Alberto Garcia
2016-09-05 8:52 ` Pradeep Kiruvale
0 siblings, 1 reply; 5+ messages in thread
From: Alberto Garcia @ 2016-09-05 8:33 UTC (permalink / raw)
To: Pradeep Kiruvale; +Cc: qemu-discuss, qemu-devel
On Fri, Sep 02, 2016 at 05:13:40PM +0200, Pradeep Kiruvale wrote:
> I am planning to implement throttling functionality for virtio-net
> driver using the throttling APIs that exist inside qemu.
Hi Pradeep,
the problem with implementing throttling for the network is that
it's useless if you use the vhost_net kernel accelerator, because it
bypasses QEMU entirely:
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Virtualization_Tuning_and_Optimization_Guide/sect-Virtualization_Tuning_Optimization_Guide-Networking-Virtio_and_vhostnet.html
libvirt implements this using tc:
https://libvirt.org/formatdomain.html#elementDomain
http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm#ceiling
Berto
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] [Qemu-discuss] Throttle in virtio-net
2016-09-05 8:33 ` [Qemu-devel] [Qemu-discuss] " Alberto Garcia
@ 2016-09-05 8:52 ` Pradeep Kiruvale
2016-09-06 14:10 ` Alberto Garcia
2016-09-06 14:37 ` Daniel P. Berrange
0 siblings, 2 replies; 5+ messages in thread
From: Pradeep Kiruvale @ 2016-09-05 8:52 UTC (permalink / raw)
To: Alberto Garcia; +Cc: qemu-discuss, qemu-devel
Hi Alberto,
Thanks for your reply.
>
> > I am planning to implement throttling functionality for virtio-net
> > driver using the throttling APIs that exist inside qemu.
>
> Hi Pradeep,
>
> the problem with implementing throttling for the network is that
> it's useless if you use the vhost_net kernel accelerator, because it
> bypasses QEMU entirely:
>
> https://access.redhat.com/documentation/en-US/Red_Hat_
> Enterprise_Linux/7/html/Virtualization_Tuning_and_Optimization_Guide/sect-
> Virtualization_Tuning_Optimization_Guide-Networking-
> Virtio_and_vhostnet.html
Thanks for this very valuable information. What if someone wants to just
use virtio-net without the vhost acceleration?
Any idea how it will be done in this case? It still uses cgroup or some
other mechanism to do throttling?
>
> libvirt implements this using tc:
>
> https://libvirt.org/formatdomain.html#elementDomain
> http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm#ceiling
Here it uses the cgroup inside the libvirt dirver to control the packet
rate right?
Thanks,
Pradeep
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] [Qemu-discuss] Throttle in virtio-net
2016-09-05 8:52 ` Pradeep Kiruvale
@ 2016-09-06 14:10 ` Alberto Garcia
2016-09-06 14:37 ` Daniel P. Berrange
1 sibling, 0 replies; 5+ messages in thread
From: Alberto Garcia @ 2016-09-06 14:10 UTC (permalink / raw)
To: Pradeep Kiruvale; +Cc: qemu-devel, qemu-discuss
On Mon 05 Sep 2016 10:52:40 AM CEST, Pradeep Kiruvale wrote:
>> > I am planning to implement throttling functionality for virtio-net
>> > driver using the throttling APIs that exist inside qemu.
>>
>> the problem with implementing throttling for the network is that
>> it's useless if you use the vhost_net kernel accelerator, because it
>> bypasses QEMU entirely:
>>
>> https://access.redhat.com/documentation/en-US/Red_Hat_
>> Enterprise_Linux/7/html/Virtualization_Tuning_and_Optimization_Guide/sect-
>> Virtualization_Tuning_Optimization_Guide-Networking-
>> Virtio_and_vhostnet.html
>
> Thanks for this very valuable information. What if someone wants to
> just use virtio-net without the vhost acceleration?
I think you can use tc just the same, as far as I'm aware that's what
libvirt does.
Berto
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] [Qemu-discuss] Throttle in virtio-net
2016-09-05 8:52 ` Pradeep Kiruvale
2016-09-06 14:10 ` Alberto Garcia
@ 2016-09-06 14:37 ` Daniel P. Berrange
1 sibling, 0 replies; 5+ messages in thread
From: Daniel P. Berrange @ 2016-09-06 14:37 UTC (permalink / raw)
To: Pradeep Kiruvale; +Cc: Alberto Garcia, qemu-devel, qemu-discuss
On Mon, Sep 05, 2016 at 10:52:40AM +0200, Pradeep Kiruvale wrote:
> Hi Alberto,
>
> Thanks for your reply.
>
> >
> > > I am planning to implement throttling functionality for virtio-net
> > > driver using the throttling APIs that exist inside qemu.
> >
> > Hi Pradeep,
> >
> > the problem with implementing throttling for the network is that
> > it's useless if you use the vhost_net kernel accelerator, because it
> > bypasses QEMU entirely:
> >
> > https://access.redhat.com/documentation/en-US/Red_Hat_
> > Enterprise_Linux/7/html/Virtualization_Tuning_and_Optimization_Guide/sect-
> > Virtualization_Tuning_Optimization_Guide-Networking-
> > Virtio_and_vhostnet.html
>
>
> Thanks for this very valuable information. What if someone wants to just
> use virtio-net without the vhost acceleration?
> Any idea how it will be done in this case? It still uses cgroup or some
> other mechanism to do throttling?
>
> >
> > libvirt implements this using tc:
> >
> > https://libvirt.org/formatdomain.html#elementDomain
> > http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm#ceiling
>
>
> Here it uses the cgroup inside the libvirt dirver to control the packet
> rate right?
No, cgroups is not involved. Libvirt attaches a tc filter directly to
the host TAP device associated with the virtual NIC.
Cgroups tc support would only be relevant if you're trying to filter
non-NIC related network traffic QEMU generates.
Regards,
Daniel
--
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^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2016-09-06 14:37 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-09-02 15:13 [Qemu-devel] Throttle in virtio-net Pradeep Kiruvale
2016-09-05 8:33 ` [Qemu-devel] [Qemu-discuss] " Alberto Garcia
2016-09-05 8:52 ` Pradeep Kiruvale
2016-09-06 14:10 ` Alberto Garcia
2016-09-06 14:37 ` Daniel P. Berrange
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