Hi, I am currently working on the virtio performance analysis in PowerPC . I was looking at the virtio front-end code and had done tracing by adding WARN_ON condition in skb_recv_done(),xmit_skb_done() and virtqueue_kick(). What I had seen is virtqueue_kick() internally it calls iowrite16() which will cause an exit to QEMU, now either I send a packets from Guest or receive a packets to guest sart_xmit() will be called and inside start_xmit there is a call to virtqueue_kick() causing Guest exit. Also for every packet or ack sent from Guest there is an exception received while sending or receiving the next packet/ack. Due to all of the above factors mentioned their will be an increase in signal, EXTINT and guest exits and hence it will effect the CPU performance. This is what my analysis is so far, it would be great if I could get some help on this such that whether it seems appropriate or not ?
Regards Nitesh Narayan Lal
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