On Mon, Jun 22, 2020 at 11:07 AM Jason Wang <jasowang@xxxxxxxxxx> wrote: > > > On 2020/6/20 上午2:07, Eugenio Perez Martin wrote: > > On Mon, Jun 15, 2020 at 2:28 PM Eugenio Perez Martin > > <eperezma@xxxxxxxxxx> wrote: > >> On Thu, Jun 11, 2020 at 5:22 PM Konrad Rzeszutek Wilk > >> <konrad.wilk@xxxxxxxxxx> wrote: > >>> On Thu, Jun 11, 2020 at 07:34:19AM -0400, Michael S. Tsirkin wrote: > >>>> As testing shows no performance change, switch to that now. > >>> What kind of testing? 100GiB? Low latency? > >>> > >> Hi Konrad. > >> > >> I tested this version of the patch: > >> https://lkml.org/lkml/2019/10/13/42 > >> > >> It was tested for throughput with DPDK's testpmd (as described in > >> http://doc.dpdk.org/guides/howto/virtio_user_as_exceptional_path.html) > >> and kernel pktgen. No latency tests were performed by me. Maybe it is > >> interesting to perform a latency test or just a different set of tests > >> over a recent version. > >> > >> Thanks! > > I have repeated the tests with v9, and results are a little bit different: > > * If I test opening it with testpmd, I see no change between versions > > * If I forward packets between two vhost-net interfaces in the guest > > using a linux bridge in the host: > > - netperf UDP_STREAM shows a performance increase of 1.8, almost > > doubling performance. This gets lower as frame size increase. > > - rests of the test goes noticeably worse: UDP_RR goes from ~6347 > > transactions/sec to 5830 > > - TCP_STREAM goes from ~10.7 gbps to ~7Gbps > > > Which direction did you mean here? Guest TX or RX? Hi Jason. For both I created a linux bridge in the host, attach two guest interfaces with vhost-net, and make the netperf run on them. > > > > - TCP_RR from 6223.64 transactions/sec to 5739.44 > > > Perf diff might help. I think we can start from the RR result which > should be easier. Maybe you can test it for each patch then you may see > which patch is the source of the regression. > Ok, I will look for differences. Thanks! > Thanks >
