On Thu, Mar 21, 2013 at 07:13:19PM +0200, Michael S. Tsirkin wrote: > On Thu, Mar 21, 2013 at 10:09:02AM -0700, H. Peter Anvin wrote: > > On 03/21/2013 10:07 AM, Michael S. Tsirkin wrote: > > > > > > I just think it does not apply to BIOS so much. A bigger issue for BIOS > > > virtio performance is that it normally does not implement batching at > > > all, to keep it simple and reduce memory usage it uses a small number > > > (often 1) of outstanding buffers per queue. > > > > > > > You asked for examples, so I gave one. There is no doubt that BIOS can > > make use of this if available. > > > > What you describe above is of course a typical problem with BIOS. > > > > -hpa > > Right, thanks. > Also thanks for the spec quote, I really think we should add the config > cycle access as a guaranteed feature. It's easy and I expect all BIOS > drivers to use it. Just to clarify, I expect BIOS to use it *for config access*. Notification will support IO anyway because it's faster on KVM, so BIOS can use it directly. > -- > MST _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
