Comment 1 for bug 365233

Question: Is the stock unvirtualized Ubuntu kernel sufficient to achieve decent quality audio when running VOIP software like Asterisk?

Under EC2 the latency is a combination of the kernel Hz setting and the overhead of virtualization. For Karmic the Ubuntu kernel for EC2 will be using XEN pv-ops, which will fix some of the latency issues. Combine this with Karmic being based on 2.6.31 and this may be enough that a separate 1000Hz kernel won't be needed.