On 27/04/2015 19:06, Emilio G. Cota wrote:
> Note that I'm running with -smp 1. My guess is that the iothread
> is starved, since patch 472f4003 "Drop global lock during TCG code execution"
> removes from the iothread the ability to kick CPU threads.

In theory that shouldn't be necessary anymore.  The CPU thread should
only hold the global lock for very small periods of time, similar to KVM.

Can you post a backtrace?

Paolo

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