Re: [libvirt] [PATCH v2] qemu: Add option to enable/disable IOEventFD feature

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...