Il 25/11/2013 12:39, Gerd Hoffmann ha scritto: >> > As use case 32-bit guest could start whit small initial memory >> > and hotplug additional memory if needed up to point where 32-bit >> > PCI hole starts. That would allow guests to launch with small amount >> > but baloon up upto 2-3.5 Gb depending on machine type. >> > I could drop 32-bit guest support and do only high mem hotplug if >> > this case it not interesting to the comunity, any suggestions? > 32bit limits start to hurt with 1GB already. Kernel address space is 1G > on 32bit, so the kernel can't map all RAM all the time any more. Which > in turn adds overhead for mapping/unmapping pages if the kernel must > access highmem pages. So it's better to run 64bit guests even with alot > less than 4G of memory. > > I'd tend to just not support 32bit guests, I think it simply isn't worth > the trouble.
Also because it's just non-PAE 32-bit guests, no? PAE guests would support hotplug just fine. Paolo
