On 16/12/2015 10:28, Vincenzo Maffione wrote: > Assuming my TX experiments with disconnected backend (and I disable > CPU dynamic scaling of performance, etc.): > 1) after patch 1 and 2, virtio bottleneck jumps from ~1Mpps to 1.910 Mpps. > 2) after patch 1,2 and 3, virtio bottleneck jumps to 2.039 Mpps. > > So I see an improvement for patch 3, and I guess it's because we avoid > an additional memory translation and related overhead. I believe that > avoiding the memory translation is more beneficial than avoiding the > variable-sized memcpy. > I'm not surprised of that, because taking a brief look at what happens > under the hood when you call an access_memory() function - it looks > like a lot of operations.
Great, thanks for confirming! Paolo
