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Re: [Qemu-discuss] Throttle in virtio-net


From: Alberto Garcia
Subject: Re: [Qemu-discuss] Throttle in virtio-net
Date: Mon, 5 Sep 2016 10:33:55 +0200
User-agent: Mutt/1.5.23 (2014-03-12)

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



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