[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] Xen as a kernel module
> Secondly, there have been repeated reports on this list of > people having > problems with lower performance in domU than in dom0, perhaps due to > cheap hardware, perhaps just due to misconfiguration, I think most of these problems were down to debugging accidently getting enabled in the stable build. We seem to be back to normal performance now. I think there are still some issues with particular ioapic's, but this code is about to get rewritten and moved into dom0 anyhow. > and the > figures on > the Xen website have not been updated to reflect what the actual > situation is, so I guess nobody knows what the overhead will > look like > for a specific type of application. The performance figures for SPECCPU, OSDB/PostgreSQl, SPECWeb99/Apache, Postmark etc are pretty much identical between 2.0 and 1.2 --- see the "Safe Hardware Access with the Xen Virtual Machine Monitor" paper. The new IO model tends to burn more CPU for a given IO rate, but under high load things pipeline reasonably nicely and the privilege transitions are amortized. Latency does suffer, but it was never that great under 1.2 anyhow. Smarter NICs will help this a lot (e.g. see the Arsenic paper by myself and Keir). Ian ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/xen-devel
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