Hi Kevin, Thanks for running that test.
Cheers, Billy. > -----Original Message----- > From: Kevin Traynor [mailto:ktray...@redhat.com] > Sent: Tuesday, March 21, 2017 10:58 AM > To: O Mahony, Billy <billy.o.mah...@intel.com>; d...@openvswitch.org > Cc: Loftus, Ciara <ciara.lof...@intel.com>; Maxime Coquelin > <maxime.coque...@redhat.com> > Subject: Re: [ovs-dev] [PATCH] netdev-dpdk: Enable INDIRECT_DESC on > DPDK vHostUser. > > On 03/20/2017 11:19 AM, O Mahony, Billy wrote: > > Hi Kevin, > > > > > >> -----Original Message----- > >> From: Kevin Traynor [mailto:ktray...@redhat.com] > >> Sent: Thursday, March 16, 2017 6:35 PM > >> To: O Mahony, Billy <billy.o.mah...@intel.com>; d...@openvswitch.org > >> Cc: Loftus, Ciara <ciara.lof...@intel.com>; Maxime Coquelin > >> <maxime.coque...@redhat.com> > >> Subject: Re: [ovs-dev] [PATCH] netdev-dpdk: Enable INDIRECT_DESC on > >> DPDK vHostUser. > >> > >> On 03/01/2017 12:36 PM, Billy O'Mahony wrote: > >>> Hi All, > >>> > >>> I'm creating this patch on the basis of performance results outlined > >>> below. In summary it appears that enabling INDIRECT_DESC on DPDK > >>> vHostUser ports leads to very large increase in performance when > >>> using linux stack applications in the guest with no noticable > >>> performance drop for DPDK based applications in the guest. > >>> > >>> Test#1 (VM-VM iperf3 performance) > >>> VMs use DPDK vhostuser ports > >>> OVS bridge is configured for normal action. > >>> OVS version 603381a (on 2.7.0 branch but before release, > >>> also seen on v2.6.0 and v2.6.1) DPDK v16.11 QEMU v2.5.0 (also > >>> seen with v2.7.1) > >>> > >>> Results: > >>> INDIRECT_DESC enabled 5.30 Gbit/s > >>> INDIRECT_DESC disabled 0.05 Gbit/s > >>> > >>> Test#2 (Phy-VM-Phy RFC2544 Throughput) DPDK PMDs are polling NIC, > >>> DPDK loopback app running in guest. > >>> OVS bridge is configured with port forwarding to VM (via > >>> dpdkvhostuser > >> ports). > >>> OVS version 603381a (on 2.7.0 branch but before release), > >>> other versions not tested. > >>> DPDK v16.11 > >>> QEMU v2.5.0 (also seen with v2.7.1) > >>> > >>> Results: > >>> INDIRECT_DESC enabled 2.75 Mpps @64B pkts (0.176 Gbit/s) > >>> INDIRECT_DESC disabled 2.75 Mpps @64B pkts (0.176 Gbit/s) > >>> > >> > >> Hi Billy, I see a slight drop (3%) with indirect descriptors enabled > >> and a raw throughput test. Ciara previously reported 6%. Did you test > >> this as well as the 0% loss test? > > > > [[BO'M]] > > I didn't repeat the test but I did discuss with all of the team here before > submitting the patch and we were happy to proceed. > > > > The feeling was that the a raw throughput test (i.e. the 'fire hydrant' test > where the packets are sent at line rate and the result is the number of > packets forwarded regardless of loss rate) while quick to perform is not as > relevant as a maximum lossless forwarding rate test. > > > > 0% loss is ultra sensitive to glitches/tuning and nobody knows what tuning > you have on your system. Raw throughput, or RFC2544 with a small > acceptable loss, is also useful as it allows for glitches/tuning differences > and > may indicate if you are creating a bottleneck for someone who's system is > tuned differently. In this case though, I've run it and it's only a small few > % so > it should be fine. > > >> Kevin. > >> > >>> > >>> Billy O'Mahony (1): > >>> netdev-dpdk: Enable INDIRECT_DESC on DPDK vHostUser. > >>> > >>> lib/netdev-dpdk.c | 3 +-- > >>> 1 file changed, 1 insertion(+), 2 deletions(-) > >>> > > _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev
