Acked-by: Darrell Ball <dlu...@gmail.com>
On 4/10/17, 4:21 AM, "Kevin Traynor" <ktray...@redhat.com> wrote:
On 04/10/2017 08:03 AM, Darrell Ball wrote:
>
>
> On 4/5/17, 7:52 AM, "ovs-dev-boun...@openvswitch.org on behalf of O
Mahony, Billy" <ovs-dev-boun...@openvswitch.org on behalf of
billy.o.mah...@intel.com> wrote:
>
> > -----Original Message-----
> > From: Kevin Traynor [mailto:ktray...@redhat.com]
> > Sent: Wednesday, April 5, 2017 2:58 PM
> > To: O Mahony, Billy <billy.o.mah...@intel.com>; Maxime Coquelin
> > <maxime.coque...@redhat.com>; d...@openvswitch.org
> > Subject: Re: [ovs-dev] [PATCH] netdev-dpdk: Enable INDIRECT_DESC on
> > DPDK vHostUser.
> >
> > On 03/20/2017 11:18 AM, O Mahony, Billy wrote:
> > > Hi Maxime,
> > >
> > >> -----Original Message-----
> > >> From: Maxime Coquelin [mailto:maxime.coque...@redhat.com]
> > >> Sent: Friday, March 17, 2017 9:48 AM
> > >> To: O Mahony, Billy <billy.o.mah...@intel.com>;
d...@openvswitch.org
> > >> Subject: Re: [ovs-dev] [PATCH] netdev-dpdk: Enable INDIRECT_DESC
on
> > >> DPDK vHostUser.
> > >>
> > >> Hi Billy,
> > >>
> > >> On 03/01/2017 01:36 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
> > >> This is indeed a big gain.
> > >> However, isn't there a problem when indirect descriptors are
disabled?
> > >> 0.05 Gbits/s is very low, no?
> > >
> > > [[BO'M]] Yes the disabling of the indirect descriptors feature
appears to be
> > what causes the very low test result. And the root cause may
actually be
> > related to this bug
> > https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1668829 .
> > However, turning on the indirect descriptors certainly helps
greatly.
> > >
> > >>
> > >> Could you share the iperf3 command line you used?
> > >
> > > [[BO'M]] In the server VM "iperf3 -s" and in the client "iperf3
-c <server ip
> > addr> -t 30". -t 30 is the duration (secs) of the test. OVS-DPDK
bridge was set
> > to use normal action.
> > >
> > Hi Billy,
> >
> > I ran the iperf test on master and I see very different results
than you got?
> >
> > mrg on/indirect off: 7.10 Gbps
> > mrg off/indirect off: 5.05 Gbps
> > mrg off/indirect on: 7.15 Gbps
>
> [[BO'M]]
> Hi Kevin,
>
> By those figures the performance is still +40% in the right direction
for using indirect descriptors.
>
> What version of qemu did you use? (if as per the Launchpad bug qemu
is a root cause here). Also in that case kernel versions may be significant.
>
> I was using qemu 2.5 (tagged release, built locally) and Ubuntu
16.04.01 with 4.04 kernel in the guest.
>
> I can retry the tests with head of master when I get a chance but the
patch is still offering a large improvement.
>
> Cheers,
> Billy.
>
> I tried it as well, on one server…
> Test#1 (VM-VM iperf3 performance):
> DPDK v16.11 QEMU v2.5.0, OVS 2.7.0 branch also before release/similar
relevant content.
> mrg off
> Indirect off: 0.164 Gbps
> Indirect on: 2.01 Gbps
>
> Are there any significant reasons not to merge this patch ?
>
No, I think it's ok to merge. I did some additional testing with % loss
and DPDK in the guest and did not see any significant difference.
Acked-by: Kevin Traynor <ktray...@redhat.com>
> >
> > Kevin.
> >
> > >>
> > >>> 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)
> > >>
> > >> Is this with 0% packet loss?
> > > [[BO'M]] Yes. To an accuracy of .05 Mpps.
> > >>
> > >> Regards,
> > >> Maxime
> > > _______________________________________________
> > > dev mailing list
> > > d...@openvswitch.org
> > >
https://urldefense.proofpoint.com/v2/url?u=https-3A__mail.openvswitch.org_mailman_listinfo_ovs-2Ddev&d=DwICAg&c=uilaK90D4TOVoH58JNXRgQ&r=BVhFA09CGX7JQ5Ih-uZnsw&m=N-90MtQTpByf75yO-qoXyVLC7NqPpmWBKW3hZRlofyk&s=x-LS86EsgYxoUprrL5UFic980t77wrS9wrIVG56nxfY&e=
> > >
>
> _______________________________________________
> dev mailing list
> d...@openvswitch.org
>
https://urldefense.proofpoint.com/v2/url?u=https-3A__mail.openvswitch.org_mailman_listinfo_ovs-2Ddev&d=DwICAg&c=uilaK90D4TOVoH58JNXRgQ&r=BVhFA09CGX7JQ5Ih-uZnsw&m=N-90MtQTpByf75yO-qoXyVLC7NqPpmWBKW3hZRlofyk&s=x-LS86EsgYxoUprrL5UFic980t77wrS9wrIVG56nxfY&e=
>
>
_______________________________________________
dev mailing list
d...@openvswitch.org
https://mail.openvswitch.org/mailman/listinfo/ovs-dev
