Chris Lalancette wrote: > All, > I've been doing some migration testing of KVM guests, and have been > running > into some problems. Let me describe the setup and what I've tried, and maybe > somebody has some ideas about what might be going on here. > > When I try to do > live migration this way, things seem like they work, and it even seems like a > few instructions get executed on the destination side. However, fairly > quickly > I'll get "Disabling IRQ #11" on the console of the guest at the destination, > and > the qemu process will just spin at 100%, with no interaction possible. IRQ > #11, > incidentally, is the IRQ associated with the emulated rtl8139 card. > > This led me to suspect the in-kernel PIC/APIC emulation, and, sure enough, if > I > pass -no-kvm-irqchip (on both the source and destination), things are better; > I > can at least migrate from the host to the destination without the "Disabling > IRQ > #11" message. However, if I put any sort of load on the guest while doing > migration, I still get a hang-up, even with -no-kvm-irqchip. > > Has anyone else seen this, or have ideas where I can start debugging it? > > Thanks, > Chris Lalancette > Hi Chris,
I am chasing migration bug(s) too. I think the problem lies in userspace and not in the kernel modules. It seems that for kvm-56 migration works but for kvm-57 it does not. The problem seems to be related to the qemu-cvs merge: 25a2e04e5689af63d104de2dea755f30bf643afd If you run it with -no-kvm migration seems to be working. The test case I'm using is savevm/loadvm. After a loadvm my FC6 guest gets double-fault (<qemu-cmdline> -loadvm <id>). Adding '-no-kvm-irqchip' does not help. But if I start qemu in a stopped mode (<qemu-cmdline> -S) and 'loadvm <id>' in qemu-monitor, it works. Sometimes after lodavm guest network does work better with '-no-kvm-irqchip' I am trying to use bisection to find the problematic patch. Thanks, Uri. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
