[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Report on Virtualization in Clusters
On Sun, Nov 28, 2004 at 11:17:03AM +0000, Ian Pratt wrote: > > > > It seems from your tests without interrupt coalescing that Xen has a > > > higher interrupt-handling overhead than native Linux. I suppose that > > > with the new IO model, Xen needs to flush the TLBs for every interrupt > > > that arrives. Do you think this is the reason for the overhead, or are > > > the performance problems only due to your hardware being badly supported > > > by Xen? > > > > My guess is that it is the former, because we "solved" the problem with the > > IOAPIC bug with 'ignorebiostables'. Thus using legacy PIC, everything > > seemed to behave normally except when not using IC. > > > > I think it boils down to whether or not using legacy PIC as opposed to (a > > supported) IOAPIC has an impact on interrupt handling. If it does, I think > > it's the latter reason, otherwise I think it's the former. > > The fact that you had to disable the IOAPIC with ignorebiostables > is rather concerning. It certainly sounds like Xen is really > struggling on your platform. What motherboard chipset are the > machines in your cluster? They are Intel 875P chipsets Håvard ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/xen-devel
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |