[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Questions about certain Xen limits and features
On 7/11/08 14:01, "Vessey, Bruce A" <Bruce.Vessey@xxxxxxxxxx> wrote: > (1) What's the largest number of "logical processors" that Xen supports > on the host system? For me, this translates to cores. I prefer to keep > hyperthreading out of the picture. (I believe that this was 126 in 3.3, > but is changing to "unlimited" based on Jan Beulich's recent work. Is > that correct?) The default build configuration is for 64 CPUs. You have to re-build Xen to configure support for more CPUs than that. Yes, 126 is the limit for 3.3. > (2a) What's the largest host memory that anybody has tested? > (2b) What's the expected host memory limit (if somebody was able to > configure a system that large)? I think 256GB has been tested. Theoretically we're good up to 1TB, and we could expand beyond even that without too much trouble. > (3a) What's the largest guest memory that anybody has tested? > (3b) What's the expected guest memory limit (if somebody was able to > configure a system that large)? I think 64GB guests are tested fairly often. There's no particular reason that a guest couldn't use all available memory, whatever that is (except for 32-bit PV guests which are limited for arcane technical reasons). > (4a) Does Xen support hot-add of physical hardware to the host system? > If so, which devices? > (4b) Hot remove? Depends what the usage scenario of those devices is. One answer would be that Xen supports device hotplug as far as dom0 supports it. > (5a) What's the maximum # of virtual NICs per guest? > (5b) What's the maximum # of virtual HBAs per guest? > (5c) What's the maximum # of LUNs per guest? > (6) What's the maximum # of powered-on guests per system? Theoretically only limited by available resources. I don't know what's actually been tested. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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