On Mon, Dec 07, 2009 at 03:30:09PM +0100, Gerd Hoffmann wrote: > On 12/07/09 15:13, Michael S. Tsirkin wrote: >> Gerd, any idea whether "one MSI-X vector" feature is worth pursuing? > > I'd rate it low priority. First because virtio-enabled guests can use > virtio-net+blk. Also because with the upcoming p35 support we'll get a > more modern pc emulation including a ioapic with all 24 IRQ lines being > wired up, which will help reducing IRQ sharing too. > > MSI support (no -X) could be more intresting (for emulated devices) as > it is older and thus support is more common. My T60 for example has no > device with MSI-X support but 9 with MSI support. Linux turns on MSI > for 7 of them (4 PCIe ports, e1000, ahci, iwl3945). > > cheers, > Gerd
Yes, but what matters is guest support I think. On windows it seems that both msix and msi support were added simulataneously. It won't be hard to add MSI support, but let's determine when is it needed. -- MST
