Hi Michael,

On Thu, Jan 16, 2014 at 3:53 AM, Michael S. Tsirkin [off-list ref] wrote:

Hmm this adds overhead just to prevent sysfs from getting wrong value.
Can't sysfs simply disable softirq while it's reading the value?

Yes I think this would work, we could call napi_disable(), read the
average packet length from the receive_queue, and then call
virtnet_napi_enable(). That would eliminate the need for the seqcount.

Best,

Mike