On 02/21/2013 07:47 AM, Peter Krempa wrote: > Qemu's implementation of virtio RNG supports rate limiting of the > entropy used. This patch exposes the option to tune this fucntionality.
s/fucntionality/functionality/ > > This patch is based on qemu commit 904d6f588063fb5ad2b61998acdf1e73fb4 > > The rate limiting is exported in the XML as: > <devices> > ... > <rng model='virtio'> > <rate period='1234'>4321</rate> So period='nnn', if provided, is in milliseconds? > <backend model='random'/> > </rng> > ... > --- > > Notes: > Version 2: > - Qemu uses bytes/period, adapt the value according to that > > @@ -4315,6 +4316,14 @@ qemu-kvm -net nic,model=? /dev/null > <li>'virtio' — supported by qemu and virtio-rng kernel > module</li> > </ul> > </dd> > + <dt><code>rate</code></dt> > + <dd> > + <p> > + The rate parameter allows to limit the rate that the entropy can be > + read from the source. The value is in bits that the device is > allowed > + to read in the selected period. The default period is 1000ms or 1 > second. > + </p> This documentation didn't quite make it clear that 'period' is an optional attribute in milliseconds. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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