On Fri, Oct 4, 2019 at 1:09 AM William Tu <u9012...@gmail.com> wrote: > > Hi Tonghao, > > Thanks for the patch. > > > On 29 Sep 2019, at 19:09, xiangxia.m....@gmail.com wrote: > > > > > From: Tonghao Zhang <xiangxia.m....@gmail.com> > > > > > > This series patch optimize openvswitch. > > > > > > Patch 1, 2, 4: Port Pravin B Shelar patches to > > > linux upstream with little changes. > > > > > I thought the idea of adding another cache before the flow mask > was rejected before, due to all the potential issue of caches, ex: > cache is exploitable, and performance still suffers when your cache > is full. See David's slides below: > [1] http://vger.kernel.org/~davem/columbia2012.pdf > > Do you have a rough number about how many flows this flow mask > cache can handle? Now we can cache 256 flows on a CPU, so if there are 40 CPUs, 256*10 flows will be cached. the value of flow-mask is defined using MC_HASH_ENTRIES macro define. We can change the value according to different use case and CPU L1d cache.
> > > Patch 5, 6, 7: Optimize the flow looking up and > > > simplify the flow hash. > > I think this is great. > I wonder what's the performance improvement when flow mask > cache is full? I will test the case, I think this feature should work well with RSS and irq affinity. > Thanks > William > > > > > > > Patch 8: is a bugfix. > > > > > > The performance test is on Intel Xeon E5-2630 v4. > > > The test topology is show as below: > > > > > > +-----------------------------------+ > > > | +---------------------------+ | > > > | | eth0 ovs-switch eth1 | | Host0 > > > | +---------------------------+ | > > > +-----------------------------------+ > > > ^ | > > > | | > > > | | > > > | | > > > | v > > > +-----+----+ +----+-----+ > > > | netperf | Host1 | netserver| Host2 > > > +----------+ +----------+ > > > > > > We use netperf send the 64B frame, and insert 255+ flow-mask: > > > $ ovs-dpctl add-flow ovs-switch > > > "in_port(1),eth(dst=00:01:00:00:00:00/ff:ff:ff:ff:ff:01),eth_type(0x0800),ipv4(frag=no)" > > > 2 > > > ... > > > $ ovs-dpctl add-flow ovs-switch > > > "in_port(1),eth(dst=00:ff:00:00:00:00/ff:ff:ff:ff:ff:ff),eth_type(0x0800),ipv4(frag=no)" > > > 2 > > > $ netperf -t UDP_STREAM -H 2.2.2.200 -l 40 -- -m 18 > > > > > > * Without series patch, throughput 8.28Mbps > > > * With series patch, throughput 46.05Mbps > > > > > > Tonghao Zhang (9): > > > net: openvswitch: add flow-mask cache for performance > > > net: openvswitch: convert mask list in mask array > > > net: openvswitch: shrink the mask array if necessary > > > net: openvswitch: optimize flow mask cache hash collision > > > net: openvswitch: optimize flow-mask looking up > > > net: openvswitch: simplify the flow_hash > > > net: openvswitch: add likely in flow_lookup > > > net: openvswitch: fix possible memleak on destroy flow table > > > net: openvswitch: simplify the ovs_dp_cmd_new > > > > > > net/openvswitch/datapath.c | 63 +++++---- > > > net/openvswitch/flow.h | 1 - > > > net/openvswitch/flow_table.c | 318 > > > +++++++++++++++++++++++++++++++++++++------ > > > net/openvswitch/flow_table.h | 19 ++- > > > 4 files changed, 330 insertions(+), 71 deletions(-) > > > > > > -- > > > 1.8.3.1 > > _______________________________________________ > > dev mailing list > > d...@openvswitch.org > > https://mail.openvswitch.org/mailman/listinfo/ovs-dev
