[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Xen Performance
Michael David Crawford <mdc@xxxxxxxxx> writes: > Why do HVMs perform so poorly under Xen? My experience so far is that > they go at less then five percent of the speed they would on a > physical machine. Because without paravirtualized drivers, all I/O goes through what is essentially quemu. Slow. Five percent seems a bit slow for that; but the I/O degridation is pretty significant. > A typical example of what I am experiencing is that with a single 2.5 > GHz Xeon vCPU and 512 MB of RAM, BeOS 5 Pro takes about fifteen > minutes to boot to the desktop. > But when installed directly on a 233 MHz Pentium II, getting to the > desktop takes less than a minute. There is weirdness with some other operating systems; sometimes they depend on some hardware feature that is normally not in the critcal path so they end up slow or not working at all. For a while, FreeBSD had all kinds of trouble running under HVM mode. (It works fine these days, of course, I/O is still slow. ) running xenoprofile would probably be enlightening, but I don't know if that is too much work, if it works fine under other virtualization systems. _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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