Hi.
Your test results looks very strange.
1. Why "bi-Direction" results for testpmd are lower than "1-Direction" ?
2. Could you, please, configure EMC probability to 1 for 2.8 and 2.9 cases.
This could make tests more stable.
3. Why you're using "n_rxq_desc=256" for physical NICs? If you're testing
a zero packet drop rates, this could be a serious issue.
Why not OVS default 2048 ?
4. I hardly believe that testpmd could not achieve 10G line rate (14 Mpps)
in this simple scenario. What CPU you're using? Is it low-power ARM core?
5. "Flame Graph"s are not much useful to check 10% performance difference.
6. Looks like second PMD is idle in Flame Graph for 2.9.
7. "-n 7"... Hmm, you have some really interesting system.
8. Is there some reason to fix mbuf/mempool sizes to particular values?
9. How much time your test works for one case?
10. What is the NUMA/threads topology of your system? (To be sure that your
cpu cores are not siblings/located on different NUMA)
Best regards, Ilya Maximets.
On 09.07.2018 20:36, Jay Ding wrote:
> Hi Ilya,
>
> Here is the test result for performance of OVS-2.7, 2.8, and 2.9. We do see
> the performance drops by 10% from OVS-2.7 to OVS-2.9. The performance of DPDK
> only (testpmd) is same for those versions. Please refer to the table for the
> versions of DPDK we tested.
>
> The setup is Ixia <->PF0(OVS)PF1<->Ixia. Only one rxq is used. The test was
> running on Intel 82599ES 10-G.
>
> I attached the profiles for each version for your reference. We also recorded
> the profiles with O0. I can send them over if you need them.
>
> -g -O2' 1-Direction -g -O2' bi-Direction -g -O0'
> 1-Direction -g -O0' bi-Direction
> Intel 82599ES 10-Gigabit SFI/SFP+
>
> rxq=1 , pmd-rxq-affinity=0:1/0:3 Mpps drop Mpps drop Mpps
> drop Mpps drop
> DPDK-16.11.7/OVS-2.7 8.56 16.66 2.01
> 4.02
> DPDK-17.05.2/OVS-2.8 8.38 2% 16.46 1% 1.96 2% 3.92
> 2%
> DPDK-17.11.3/OVS-2.9 7.73 10% 15.18 9% 1.78 11% 3.56
> 11%
> Testpmd --rxq=1 --txq=1
>
> DPDK-16.11.7 12.05 9.08
> DPDK-17.05.2 12.05 9.08
> DPDK-17.11.3 12.05 9.08
>
>
> OVS setup (only list the steps with parameters):
> ./utilities/ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=0xfffe
> ./utilities/ovs-vsctl add-port br0 dpdk128 -- set Interface dpdk128 type=dpdk
> options:dpdk-devargs=0000:05:00.0 options:n_rxq_desc=256
> options:n_txq_desc=1024 ofport_request=1
> ./utilities/ovs-vsctl add-port br0 dpdk129 -- set Interface dpdk129 type=dpdk
> options:dpdk-devargs=0000:05:00.1 options:n_rxq_desc=256
> options:n_txq_desc=1024 ofport_request=2
> ./utilities/ovs-vsctl set Interface dpdk128 options:n_rxq=1
> other_config:pmd-rxq-affinity="0:1"
> ./utilities/ovs-vsctl set Interface dpdk129 options:n_rxq=1
> other_config:pmd-rxq-affinity="0:3"
>
> Testpmd setup:
> build/app/testpmd -c 0xfe -n 7 -w 0000:05:00.0 -w 0000:05:00.1
> -mbuf-size=4096 -- --total-num-mbufs=409600 -i --nb-cores=6 --rxq=1 --txq=1
> --rxd=1024 --txd=1024 --port-topology=paired
>
> Please let us know if you need more information.
>
> Thanks,
>
> Jay
>
> On Tue, Jul 3, 2018 at 6:44 AM, Shahaji Bhosle <[email protected]
> <mailto:[email protected]>> wrote:
>
> Thanks Nitin.
> Hi Ilya,
> Looks like regression was in 2.8.x itself as per Nitin's email. We will
> update our results as well. Thanks, Shahaji
>
> On Tue, Jul 3, 2018 at 12:29 AM, Nitin Katiyar
> <[email protected] <mailto:[email protected]>> wrote:
>
> Hi,
> I had tested 2.8.1/2 earlier which uses 17.05.01 or 17.05.02 and
> found around 10% drop for udp traffic. OVS 2.7.4 gave the similar result as
> OVS 2.6.2 (DPDK 16.11.4). I was using Intel Niantic 82599 for testing.
>
> Regards,
> Nitin
>
> -----Original Message-----
> From: Ilya Maximets [mailto:[email protected]
> <mailto:[email protected]>]
> Sent: Monday, July 02, 2018 10:25 PM
> To: Shahaji Bhosle <[email protected]
> <mailto:[email protected]>>
> Cc: Jan Scheurich <[email protected]
> <mailto:[email protected]>>; Jay Ding <[email protected]
> <mailto:[email protected]>>; Kevin Traynor <[email protected]
> <mailto:[email protected]>>; Manasa Mudireddy
> <[email protected] <mailto:[email protected]>>; Nitin
> Katiyar <[email protected] <mailto:[email protected]>>;
> Randy Schacher <[email protected]
> <mailto:[email protected]>>; Stokes, Ian <[email protected]
> <mailto:[email protected]>>; [email protected]
> <mailto:[email protected]>
> Subject: Re: [ovs-dev] 64Byte packet performance regression on 2.9
> from 2.7
>
> Sure, you need to collect perf records for the same binary, i.e.
> built with the same compiler options (and on the same machine), to make them
> useful.
>
> Unfortunately, I have no setup to test your case right now.
> Data for 2.8 could help bisecting the issue.
>
> On 02.07.2018 18:04, Shahaji Bhosle wrote:
> > Hi Ilya,
> > Thanks for the reply.
> > For performance traffic testing we are running with -O2. You are
> right about the perf report, when were running with perf record we had set
> "-g -O0". Do you need us to run with just "-g -O2" and give you the profile,
> or any other optimization setting.
> > Do you have a test setup for running 64B packets, and see the
> difference between 2.7 and 2.9? On our side we are trying to get 2.8 to work
> so we can give you an intermediate data point. Please let us know what we can
> do to help you debug this.
> > Thanks, Shahaji
> >
> >
> > On Mon, Jul 2, 2018 at 10:55 AM, Ilya Maximets
> <[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>> wrote:
> >
> > Hi.
> > Sorry for late response.
> >
> > Looking at your perf data, I see functions like
> "dp_packet_batch_size"
> > consuming ~0.5 - 0.7 % of time. Are you building with all
> compiler
> > optimizations disabled? Otherwise where should be no such
> symbols in
> > perf report. They should be completely inlined.
> >
> > Best regards, Ilya Maximets.
> >
> > On 27.06.2018 04:48, Shahaji Bhosle wrote:
> > > Hi Ilya,
> > > Just wanted to check if you found anything interesting. Or
> anything we can try. Thanks, Shahaji
> > >
> > > On Wed, Jun 20, 2018 at 9:01 AM, Shahaji Bhosle
> <[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>
> wrote:
> > >
> > > Thanks Ilya,
> > > Sorry for the confusion with the number, we used to get
> some different numbers on both ports so were recording it per port. You have
> to compare it with the two port number....
> > >
> > > CPU mask Mpps
> > > 17.11 testpmd 6 queue 0xfe 21.5 + 21.5
> > > OvS 2.9+DPDK17.11 6 queue 0xfe 15.5 + 15.5
> > > 16.11 testpmd 6 queue 0xfe 21.5 + 21.5
> > > OvS 2.7+DPDK16.11 6 queue 0xfe 17.4+17.4
> > >
> > >
> > > Thanks, Shahaji
> > >
> > > On Wed, Jun 20, 2018 at 8:34 AM, Ilya Maximets
> <[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>> wrote:
> > >
> > > Ok, I'll look at the data later.
> > >
> > > But your testpmd results are much lower than OVS
> results. 21.5Mpps for testpmd
> > > versus 33.8Mpps for OVS. OVS should work slower than
> testpmd, because it performs
> > > a lot of parsing and processing while testpmd does
> not.
> > > You probably tested testpmd in deifferent environment
> or allocated less amount
> > > of resources for PMD htreads. Could you please
> recheck?
> > >
> > > What is your OVS configuration (pmd-cpu-mask, n_rxqs
> etc.)?
> > > And what is your testpmd command-line?
> > >
> > > On 20.06.2018 14:54, Shahaji Bhosle wrote:
> > > > Thanks Ilya,
> > > > Attaching the two perf reports...We did run testpmd
> on its own, there were no red flags there. In some of the cases like flowgen
> 17.11 performs much better than 16.11, but for the macswap case, the numbers
> are below. Let me know if you cannot see the attached perf reports. I can
> just cut and paste them in the email if attachment does not work. Sorry I am
> not sure I can post these on any outside servers. Let me know
> > > > Thanks, Shahaji
> > > >
> > > > *DPDK on Maia (macswap)* *Rings*
> *Mpps* *Cycles/Packet*
> > > > 17.11 testpmd 6 queue 21.5
> + 21.5 60
> > > > 1 queue
> 10.4+10.4 14
> > > > 16.11 testpmd 6 queue 21.5
> + 21.5 60
> > > > 1 queue
> 10.4+10.4 14
> > > >
> > > >
> > > > On Wed, Jun 20, 2018 at 4:52 AM, Ilya Maximets
> <[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>> wrote:
> > > >
> > > > Looking at your perf stats I see following:
> > > >
> > > > OVS 2.7:
> > > >
> > > > ??.??% - dp_netdev_process_rxq_port
> > > > |-- 93.36% - dp_netdev_input
> > > > |-- ??.??% - netdev_rxq_recv
> > > >
> > > > OVS 2.9:
> > > >
> > > > 99.69% - dp_netdev_process_rxq_port
> > > > |-- 79.45% - dp_netdev_input
> > > > |-- 11.26% -
> dp_netdev_pmd_flush_output_packets
> > > > |-- ??.??% - netdev_rxq_recv
> > > >
> > > > Could you please fill the missed (??.??) values?
> > > > This data I got from the picture attached to
> the previous mail, but pictures
> > > > are still not allowed in mail-list (i.e.
> stripped). It'll be good if you can
> > > > upload your raw data to some external resource
> and post the link here.
> > > >
> > > > Anyway, from the data I have, I can see that
> total sum of time spent in
> > > > "dp_netdev_input" and
> "dp_netdev_pmd_flush_output_packets" for 2.9 is 90.71%,
> > > > which is less then 93.36% spent for 2.7. This
> means that processing + sending
> > > > become even faster or remains with the
> approximately same performance.
> > > > We definitely need all the missed values to be
> sure, but it seems that the
> > > > "netdev_rxq_recv()" could be the issue.
> > > >
> > > > To check if DPDK itself causes the performance
> regression, I'd ask you
> > > > to check pure PHY-PHY test with testpmd app
> from DPDK 16.11 and DPDK 17.11.
> > > > Maybe it's the performance issue with bnxt
> driver that you're using.
> > > > There was too many changes in that driver:
> > > >
> > > > 30 files changed, 17189 insertions(+), 3358
> deletions(-)
> > > >
> > > > Best regards, Ilya Maximets.
> > > >
> > > > On 20.06.2018 01:18, Shahaji Bhosle wrote:
> > > > > Hi Ilya,
> > > > > This issue is a release blocker for us, just
> wanted to check check if you need more details from us? Anything to expedite
> or root cause the problem we can help
> > > > > Please let us know
> > > > > Thanks Shahaji
> > > > >
> > > > > On Mon, Jun 18, 2018 at 10:20 AM Shahaji
> Bhosle <[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>>>>>> wrote:
> > > > >
> > > > > Thanks Ilya, I will look at the commit,
> but not sure now how to tell how much real work is being done, I would have
> liked polling cycles to be treated as before and not towards packet
> processing. That does explain, as long as there are packets on the wire we
> are always 100%, basically cannot tell how efficiently the CPUs are being
> used.
> > > > > Thanks, Shahaji
> > > > >
> > > > > On Mon, Jun 18, 2018 at 10:07 AM, Ilya
> Maximets <[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>>> wrote:
> > > > >
> > > > > Thanks for the data.
> > > > >
> > > > > I have to note additionally that the
> meaning of "processing cycles"
> > > > > significantly changed since the
> following commit:
> > > > >
> > > > > commit
> a2ac666d5265c01661e189caac321d962f54649f
> > > > > Author: Ciara Loftus
> <[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>>>>>>
> > > > > Date: Mon Feb 20 12:53:00 2017
> +0000
> > > > >
> > > > > dpif-netdev: Change
> definitions of 'idle' & 'processing' cycles
> > > > >
> > > > > Instead of counting all
> polling cycles as processing cycles, only count
> > > > > the cycles where packets were
> received from the polling.
> > > > >
> > > > > This could explain the difference in
> "PMD Processing Cycles" column,
> > > > > because successful "POLLING" cycles
> are now included into "PROCESSING".
> > > > >
> > > > > Best regards, Ilya Maximets.
> > > > >
> > > > > On 18.06.2018 16:31, Shahaji Bhosle
> wrote:
> > > > > > Hi Ilya,
> > > > > > Thanks for the quick reply,
> > > > > > Please find the numbers for our
> PHY-PHY test, please note that with OVS 2.9.1 + DPDK 17.11 even a 10% of the
> below numbers will make the OVS 2.9+DPDK17.11 processing cycles to hit 100%,
> but 2.7 will on our setup never goes above 75% for processing cycles. I am
> also attaching the perf report between the two code bases and I think the
> "11.26%--dp_netdev_pmd_flush_output_packets" is causing us to take the
> performance hit. Out testing is also SRIOV and CPUs are ARM A72 cores. We are
> happy to run more tests, it is not easy for use to move back to OVS 2.8, but
> could happy to try more experiments if it helps us narrow down further.
> Please note we have also tried increasing the tx-flush-interval and it helps
> a little but still not significant enough. Let us know.
> > > > > >
> > > > > > Thanks, Shahaji
> > > > > >
> > > > > >
> > > > > > *Setup:*
> > > > > > IXIA<----SFP28--->Port 0
> {(PF0)==[OVS+DPDK]==(PF1)} Port 1<-----SFP28---->IXIA
> > > > > >
> > > > > > release/version config Test
> direction MPPS Ixia Line rate (%) PMD Processing Cycles (%)
> > > > > > OVS 2.9 + DPDK 17.11 OVS on Maia
> (PF0--PF1) No drop port 1 to 2 31.3 85 99.9
> > > > > >
> port 2 to 1 31.3 85 99.9
> > > > > >
> bi 15.5 + 15.5 42 99.9
> > > > > >
>
> > > > > >
>
> > > > > > OVS 2.7 + DPDK 16.11 OVS on Maia
> (PF0--PF1) No drop port 1 to 2 33.8 90 71
> > > > > >
> port 2 to 1 32.7 88 70
> > > > > >
> bi 17.4+17.4 47 74
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > On Mon, Jun 18, 2018 at 4:25 AM,
> Nitin Katiyar <[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected]
> <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> > <mailto:[email protected]
> <mailto:[email protected]>>> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>>>>>>> wrote:
> > > > > >
> > > > > > Hi,
> > > > > > We also experienced degradation
> from OVS2.6/2.7 to OVS2.8.2(with DPDK17.05.02). The drop is more for 64 bytes
> packet size (~8-10%) even with higher number of flows. I tried OVS 2.8 with
> DPDK17.11 and it improved for higher packet sizes but 64 bytes size is still
> the concern.
> > > > > >
> > > > > > Regards,
> > > > > > Nitin
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: Ilya Maximets
> [mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> > <mailto:[email protected]
> <mailto:[email protected]>>>>>>]
> > > > > > Sent: Monday, June 18, 2018
> 1:32 PM
> > > > > > To: [email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>>> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>>>> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>>> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> <mailto:[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
> <mailto:[email protected]
> <mailto:[email protected]>
> > <mailto:[email protected]
> <mailto:[email protected]>> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>>>>>>; [email protected]
> <mailto:[email protected]> <mailto:[email protected]
> <mailto:[email protected]>> <mailto:[email protected]
> <mailto:[email protected]> <mailto:[email protected]
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> > > > > > Subject: Re: [ovs-dev] 64Byte
> packet performance regression on 2.9 from 2.7
> > > > > >
> > > > > > CC: Shahaji Bhosle
> > > > > >
> > > > > > Sorry, missed you in CC list.
> > > > > >
> > > > > > Best regards, Ilya Maximets.
> > > > > >
> > > > > > On 15.06.2018 10:44, Ilya
> Maximets wrote:
> > > > > > >> Hi,
> > > > > > >> I just upgraded from OvS 2.7
> + DPDK 16.11 to OvS2.9 + DPDK 17.11 and
> > > > > > >> running into performance
> issue with 64 Byte packet rate. One
> > > > > > >> interesting thing that I
> notice that even at very light load from
> > > > > > >> IXIA the processing cycles
> on all the PMD threads run close to 100%
> > > > > > >> of the cpu cycle on 2.9 OvS,
> but on OvS 2.7 even under full load the
> > > > > > >> processing cycles remain at
> 75% of the cpu cycles.
> > > > > > >>
> > > > > > >> Attaching the FlameGraphs of
> both the versions, the only thing that
> > > > > > >> pops out to me is the new
> way invoking netdev_send() is on 2.9 is
> > > > > > >> being invoked via
> dp_netdev_pmd_flush_output_packets() which seems
> > > > > > >> to be adding another ~11% to
> the whole rx to tx path.
> > > > > > >>
> > > > > > >> I also did try the
> tx-flush-interval to 50 and more it does seem to
> > > > > > >> help, but not significant
> enough to match the 2.7 performance.
> > > > > > >>
> > > > > > >>
> > > > > > >> Any help or ideas would be
> really great. Thanks, Shahaji
> > > > > > >
> > > > > > > Hello, Shahaji.
> > > > > > > Could you, please, describe
> your testing scenario in more details?
> > > > > > > Also, mail-list filters
> attachments, so they are not available. You
> > > > > > > need to publish them
> somewhere else or write in text format inside the letter.
> > > > > > >
> > > > > > > About the performance itself:
> Some performance degradation because of
> > > > > > > output batching is expected
> for tests with low number of flows or
> > > > > > > simple PHY-PHY tests. It was
> mainly targeted for cases with relatively
> > > > > > > large number of flows, for
> amortizing of vhost-user penalties
> > > > > > > (PHY-VM-PHY, VM-VM cases),
> OVS bonding cases.
> > > > > > >
> > > > > > > If your test involves
> vhost-user ports, then you should also consider
> > > > > > > vhost-user performance
> regression in stable DPDK 17.11 because of
> > > > > > > fixes for CVE-2018-1059.
> Related bug:
> > > > > > >
> https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>>>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>>>>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>>>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>
> <https://dpdk.org/tracker/show_bug.cgi?id=48
> <https://dpdk.org/tracker/show_bug.cgi?id=48>>>>>
> > > > > > >
> > > > > > > It'll be good if you'll be
> able to test OVS 2.8 + DPDK 17.05. There
> > > > > > > was too many changes since
> 2.7. It'll be hard to track down the root cause.
> > > > > > >
> > > > > > > Best regards, Ilya Maximets.
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> > >
> >
> >
>
>
>
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