On Tue, May 17, 2011 at 03:56:11PM +0100, Daniel P. Berrange wrote:
On Tue, May 17, 2011 at 04:49:17PM +0200, Michal Privoznik wrote:
This feature allows QEMU to achieve higher throughput, but is available only in recent versions. It is accessible via ioeventfd attribute with accepting values 'on', 'off'. Only experienced users needs to set this, because QEMU defaults to 'on', meaning higher performance. Translates into virtio-{blk|net}-pci.ioeventfd option. [...] + <li> + The optional <code>ioeventfd</code> attribute enables or disables + IOEventFD feature for virtqueue notify. The value can be either + 'on' or 'off'. + <span class="since">Since 0.9.2 (QEMU and KVM only)</span>
This is a qemu specific attribute name & description. IMHO we shouldn't be exposing that directly. Who even knows what effect it actually has on the guests...
Agreed, what is the semantic of this flag, beside allowing to switch something in qemu ? Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel@veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/