Juan Quintela <quint...@redhat.com> wrote: > Hi > > > [v12] > > Big news, it is not RFC anymore, it works reliabely for me. > > Changes: > - Locknig changed completely (several times) > - We now send all pages through the channels. In a 2GB guest with 1 disk > and a network card, the amount of data send for RAM was 80KB. > - This is not optimized yet, but it shouws clear improvements over precopy. > testing over localhost networking I can guet: > - 2 VCPUs guest > - 2GB RAM > - runn stress --vm 4 --vm 500GB (i.e. dirtying 2GB or RAM each second) > > - Total time: precopy ~50seconds, multifd around 11seconds > - Bandwidth usage is around 273MB/s vs 71MB/s on the same hardware > > This is very preleminary testing, will send more numbers when I got them. > But looks promissing. > > Things that will be improved later: > - Initial synchronization is too slow (around 1s) > - We synchronize all threads after each RAM section, we can move to only > synchronize them after we have done a bitmap syncrhronization > - We can improve bitmap walking (but that is independent of multifd)
I forgot to put there that on the last 4 patches, I have not been able to split them in a way that: - is logical for review - works for multifd tests in all versions So, I ended trynig to get the "logical" viewe, and it works after the last patch. Why is that? - Before I am able to transmit data, I need to be able to end/synchronize the different channels - To finish channels in case of error, I just close the channels But I can't opet then yet. I have to think if I can come with a simpler way to split it, but you can also consider that the last 3-4 patches are a single one. Later, Juan.
