[ovs-discuss] OVS-DPDK - Very poor performance when connected to namespace/container
Avi Cohen (A)
avi.cohen at huawei.com
Sun Jun 18 06:51:27 UTC 2017
Thank you all
1. I cannot run dpdk in the container since I have to run there applications require the linux ip-stack
2. I have ovs 2.6.1 with dpdk-stable-16.07.2 and I get an error message [could not open network device tap1 - No such device ] when try to set an af-packet port:
ip tuntap add dev tap1 mode tap
ovs-vsctl add-port br0 tap1 -- set Interface tap1 type=dpdk \
options:dpdk-devargs=eth_af_packet0,iface=tap1
in other doc I saw a bit different command with 2 if names tap1 and eth0
ovs-vsctl add-port br0 tap1 -- set Interface tap1 type=dpdk \
options:dpdk-devargs=eth_af_packet0, iface=eth0
what is the correct command ?
Best Regards
avi
> -----Original Message-----
> From: Darrell Ball [mailto:dball at vmware.com]
> Sent: Friday, 16 June, 2017 8:25 PM
> To: Mooney, Sean K; Gray, Mark D; Avi Cohen (A); users at dpdk.org; ovs-
> discuss at openvswitch.org
> Subject: Re: [ovs-discuss] OVS-DPDK - Very poor performance when connected
> to namespace/container
>
>
>
> On 6/16/17, 10:01 AM, "Mooney, Sean K" <sean.k.mooney at intel.com> wrote:
>
>
> > -----Original Message-----
> > From: Darrell Ball [mailto:dball at vmware.com]
> > Sent: Friday, June 16, 2017 5:53 PM
> > To: Gray, Mark D <mark.d.gray at intel.com>; Mooney, Sean K
> > <sean.k.mooney at intel.com>; Avi Cohen (A) <avi.cohen at huawei.com>;
> > users at dpdk.org; ovs-discuss at openvswitch.org
> > Subject: Re: [ovs-discuss] OVS-DPDK - Very poor performance when
> > connected to namespace/container
> >
> > This should be quite a bit better than the AF_PACKET PMD.
> > This becomes available in 17.08 and is important, it would be nice to
> > get into the next OVS release.
> [Mooney, Sean K]
> Virtio user will work only if you have dpdk in the container/namespce
> correct?
> The vhsot frontend is being provisioned by isided the dpdk vhost driver in the
> application.
>
> Yes, it requires more effort on the install/config side, but may be worth it in
> many cases.
>
>
> I agree that is the way to go if your application support dpdk, if not you
> would need
> To use one of the other vdevs.
>
> >
> > Also, any existing data on the performance advantage of AF_PACKET PMD
> > with single queue ?
> [Mooney, Sean K] I would be interested in seeing this also if anyone has data
> to share.
> >
> > Darrell
> >
> >
> > On 6/16/17, 1:56 AM, "ovs-discuss-bounces at openvswitch.org on behalf of
> > Gray, Mark D" <ovs-discuss-bounces at openvswitch.org on behalf of
> > mark.d.gray at intel.com> wrote:
> >
> > Hi Avi,
> >
> > The other option is to use virtio-use
> > (https://urldefense.proofpoint.com/v2/url?u=http-
> > 3A__dpdk.org_doc_guides_howto_virtio-5Fuser-5Ffor-5Fcontainer-
> >
> 5Fnetworking.html&d=DwICAg&c=uilaK90D4TOVoH58JNXRgQ&r=BVhFA09CGX
> 7JQ5Ih-
> >
> uZnsw&m=_7l_cdKorhow4zRqAu5lnTmzv9Etgn5TX7D6P0pqP8c&s=ThmUVGZC2
> M1LBAIhn
> > vs-5OiSZz7ywpez2Qj70BrQjoM&e= ) which gives dpdk-like performance to
> a
> > dpdk application running in a container. The configuration for ovs-dpdk
> > has not been documented but it is possible to use (as a vdev).
> >
> > Also, I have dropped the dpdk-ovs at lists.01.org mail address as this
> > is for the discontinued ovdk project.
> >
> > Mark
> >
> > > -----Original Message-----
> > > From: Dpdk-ovs [mailto:dpdk-ovs-bounces at lists.01.org] On Behalf
> > Of
> > > Mooney, Sean K
> > > Sent: Thursday, June 15, 2017 12:33 PM
> > > To: Avi Cohen (A) <avi.cohen at huawei.com>; dpdk-ovs at lists.01.org;
> > > users at dpdk.org; ovs-discuss at openvswitch.org
> > > Subject: Re: [Dpdk-ovs] OVS-DPDK - Very poor performance when
> > > connected to namespace/container
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: Avi Cohen (A) [mailto:avi.cohen at huawei.com]
> > > > Sent: Thursday, June 15, 2017 9:50 AM
> > > > To: Mooney, Sean K <sean.k.mooney at intel.com>; dpdk-
> > ovs at lists.01.org;
> > > > users at dpdk.org; ovs-discuss at openvswitch.org
> > > > Subject: RE: OVS-DPDK - Very poor performance when connected to
> > > > namespace/container
> > > >
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: Mooney, Sean K [mailto:sean.k.mooney at intel.com]
> > > > > Sent: Thursday, 15 June, 2017 11:24 AM
> > > > > To: Avi Cohen (A); dpdk-ovs at lists.01.org; users at dpdk.org;
> > ovs-
> > > > > discuss at openvswitch.org
> > > > > Cc: Mooney, Sean K
> > > > > Subject: RE: OVS-DPDK - Very poor performance when connected
> > to
> > > > > namespace/container
> > > > >
> > > > >
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: Dpdk-ovs [mailto:dpdk-ovs-bounces at lists.01.org] On
> > Behalf Of
> > > > > > Avi Cohen (A)
> > > > > > Sent: Thursday, June 15, 2017 8:14 AM
> > > > > > To: dpdk-ovs at lists.01.org; users at dpdk.org;
> > > > > > ovs-discuss at openvswitch.org
> > > > > > Subject: [Dpdk-ovs] OVS-DPDK - Very poor performance when
> > > > > > connected to namespace/container
> > > > > >
> > > > > > Hello All,
> > > > > > I have OVS-DPDK connected to a namespace via veth pair
> > device.
> > > > > >
> > > > > > I've got a very poor performance - compared to normal OVS
> > (i.e. no
> > > > > > DPDK).
> > > > > > For example - TCP jumbo pkts throughput: normal OVS ~
> > 10Gbps ,
> > > > OVS-
> > > > > > DPDK 1.7 Gbps.
> > > > > >
> > > > > > This can be explained as follows:
> > > > > > veth is implemented in kernel - in OVS-DPDK data is
> > transferred
> > > > from
> > > > > > veth to user space while in normal OVS we save this
> > transfer
> > > > > [Mooney, Sean K] that is part of the reason, the other reson
> > this is
> > > > > slow and The main limiter to scalling adding veth pairs or
> > ovs
> > > > > internal port to ovs with dpdk is That these linux kernel
> > ports are
> > > > > not processed by the dpdk pmds. They are server by the Ovs-
> > vswitchd
> > > > > main thread via a fall back to the non dpdk acclarated netdev
> > > > implementation.
> > > > > >
> > > > > > Is there any other device to connect to namespace ?
> > something like
> > > > > > vhost-user ? I understand that vhost-user cannot be used
> > for
> > > > > > namespace
> > > > > [Mooney, Sean K] I have been doing some experiments in this
> > regard.
> > > > > You should be able to use the tap, pcap or afpacket pmd to
> > add a
> > > > > vedv that will improve Performance. I have seen some strange
> > issue
> > > > > with
> > > > the
> > > > > tap pmd that cause packet to be drop By the kernel on tx on
> > some
> > > > ports
> > > > > but not others so there may be issues with that dirver.
> > > > >
> > > > > Previous experiment with libpcap seemed to work well with ovs
> > 2.5
> > > > > but I have not tried it With ovs 2.7/master since the
> > introduction
> > > > > of generic vdev support at runtime. Previously vdevs And to
> > be
> > > > > allocated
> > > > using the dpdk args.
> > > > >
> > > > > I would try following the af_packet example here
> > > > >
> > > >
> > > https://urldefense.proofpoint.com/v2/url?u=https-
> >
> 3A__github.com_openvswitch_ovs_blob_b132189d8456f38f3ee139f126d68&d=
> DwI
> > CAg&c=uilaK90D4TOVoH58JNXRgQ&r=BVhFA09CGX7JQ5Ih-
> >
> uZnsw&m=_7l_cdKorhow4zRqAu5lnTmzv9Etgn5TX7D6P0pqP8c&s=REyqxTB8Gd
> 9BnEtet
> > H_Aul0OgyyGK0DFhKl3tFGzOGI&e=
> > > 0
> > > > > 9 01a9ee9a8/Documentation/howto/dpdk.rst#vdev-support
> > > > >
> > > > [Avi Cohen (A)]
> > > > Thank you Mooney, Sean K
> > > > I already tried to connect the namespace with a tap device (see
> > 1 & 2
> > > > below) - and got the worst performance for some reason the
> > packet
> > > > is cut to default MTU inside the OVS-DPDK which transmit the
> > packet
> > > > to its peer. - although all interfaces MTU were set to 9000.
> > > >
> > > > 1. ovs-vsctl add-port $BRIDGE tap1 -- set Interface tap1
> > > > type=internal
> > > >
> > > > 2. ip link set tap1 netns ns1 // attach it to namespace
> > > [Mooney, Sean K] this is not using the dpdk tap pmd , internal
> > port and veth
> > > ports If added to ovs will not be accelerated by dpdk unless you
> > use a vdev to
> > > attach them.
> > > >
> > > > I'm looking at your link to create a virtual PMD with vdev
> > support - I
> > > > see there a creation of a virtual PMD device , but I'm not sure
> > how
> > > > this is connected to the namespace ? what device should I
> > assign to
> > > > the namespace ?
> > > [Mooney, Sean K]
> > > You would use it as follows
> > >
> > > ip tuntap add dev tap1 mode tap
> > >
> > > ovs-vsctl add-port br0 tap1 -- set Interface tap1 type=dpdk \
> > > options:dpdk-devargs=eth_af_packet0,iface=tap1
> > >
> > > ip link set tap1 netns ns1
> > >
> > > ip netns exec ns1 ifconfig 192.168.1.1/24 up
> > >
> > > in general though if you are using ovs-dpdk you should avoid
> > using network
> > > namespace and the kernel where possible but the above should
> > improve
> > > you performance. One caveat, the amount of vdev+phyical
> > interfaces is
> > > limited by how dpdk is compiled by default to 32 devices but it
> > can be
> > > increased to 256 if required.
> > >
> > > >
> > > > Best Regards
> > > > avi
> > > >
> > > > > if you happen to be investigating this for use with openstack
> > > > > routers we Are currently working on a way to remove the use
> > of
> > > > > namespace entirely for dvr when using The default neutron
> > agent and
> > > > > sdn controllers such as ovn already provide that
> > functionality.
> > > > > >
> > > > > > Best Regards
> > > > > > avi
> > > > > > _______________________________________________
> > > > > > Dpdk-ovs mailing list
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