On Wed, 2009-05-13 at 16:00 +0300, Avi Kivity wrote: > Alex Williamson wrote: > >> > >> When you say "multiple times", it is several, or a lot more? > >> > >> Maybe it is NAPI? > >> > > > > The system would run out of the ~1000 available GSIs in a minute or two > > with just an e1000e available to the guest. So that's something on the > > order of 10/s. This also causes a printk in the host ever time the > > interrupt in enabled, which can't help performance and gets pretty > > annoying for syslog. I was guessing some kind of interrupt mitigation, > > such as NAPI, but a qlogic FC card seems to do it too (seemingly at a > > slower rate). > > > > I see. And what is the path by which it is disabled? The mask bit in > the MSI entry? Yes, I believe the only path is via a write to the MSI capability in the PCI config space. Alex -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
