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Re: [Xen-devel] Re: 1850/2850 hangs under I/O load

Are you sure you fixed up unstable properly, and definitely were running the fixed up version? It would be quite surprising if that fix worked for xen2 but not for xen3!

I just did some tests myself, and fixing that one use of set_affinity in pirq_guest_bind ought to be sufficient to get unstable working on your boxes.

I also just added a new boot parameter 'noirqbalance' to the 2.0-testing and unstable repositories. If you're using the latest version of either of those then just add that to Xen's command line instead of manually patching the code.

You can tell if you have a recent enough source tree: xen/arch/x86/irq.c will have a new opt_noirqbalance variable declared right at the top.

I've also checked in automatic disabling of IRQ balancing/affinity in the unstable tree, so with the latest repository you shouldn't even have to add an explicit boot parameter.

If you have a serial line attached then you should see Xen print:
 XEN: Platform quirk -- Disabling IRQ balancing/affinity.

at some point during boot of domain0.

 -- Keir

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