[dpdk-users] scheduler issue

[Singh, Jasvinder]

> -----Original Message-----
> From: Alex Kiselev <alex at therouter.net>
> Sent: Wednesday, December 9, 2020 1:42 PM
> To: Singh, Jasvinder <jasvinder.singh at intel.com>
> Cc: users at dpdk.org; Dumitrescu, Cristian <cristian.dumitrescu at intel.com>;
> Dharmappa, Savinay <savinay.dharmappa at intel.com>
> Subject: Re: [dpdk-users] scheduler issue
> 
> On 2020-12-08 14:24, Singh, Jasvinder wrote:
> > <snip>
> >
> >> > [JS] now, returning to 1 mbps pipes situation, try reducing tc
> >> > period first at subport and then at  pipe level, if that help in
> >> > getting even traffic across low bandwidth pipes.
> >>
> >> reducing subport tc from 10 to 5 period also solved the problem with
> >> 1 Mbit/s pipes.
> >>
> >> so, my second problem has been solved, but the first one with some of
> >> low bandwidth pipes stop transmitting still remains.
> >>
> >
> > I see, try removing "pkt_len <= pipe_tc_ov_credits" condition in the
> > grinder_credits_check() code for oversubscription case, instead use
> > this pkt_len <= pipe_tc_credits + pipe_tc_ov_credits;
> 
> Does this address my problem with pipes stop transmitting?
> Is these already included in the newer scheduler version (19x or 20.x)?

No, It is not included in latest version. Try this at your end, if this works?


> >
> >
> >> >
> >> >
> >> >
> >> >>> rcv 0   rx rate 7324160 nb pkts 5722
> >> >>> rcv 1   rx rate 7281920 nb pkts 5689
> >> >>> rcv 2   rx rate 7226880 nb pkts 5646
> >> >>> rcv 3   rx rate 7124480 nb pkts 5566
> >> >>> rcv 4   rx rate 7324160 nb pkts 5722
> >> >>> rcv 5   rx rate 7271680 nb pkts 5681
> >> >>> rcv 6   rx rate 7188480 nb pkts 5616
> >> >>> rcv 7   rx rate 7150080 nb pkts 5586
> >> >>> rcv 8   rx rate 7328000 nb pkts 5725
> >> >>> rcv 9   rx rate 7249920 nb pkts 5664
> >> >>> rcv 10  rx rate 7188480 nb pkts 5616 rcv 11  rx rate 7179520 nb
> >> >>> pkts
> >> >>> 5609 rcv 12  rx rate 7324160 nb pkts 5722 rcv 13  rx rate 7208960
> >> >>> nb pkts 5632 rcv 14  rx rate 7152640 nb pkts 5588 rcv 15  rx rate
> >> >>> 7127040 nb pkts 5568 rcv 16  rx rate 7303680 nb pkts 5706 ....
> >> >>> rcv 587 rx rate 2406400 nb pkts 1880 rcv 588 rx rate 2406400 nb
> >> >>> pkts
> >> >>> 1880 rcv 589 rx rate 2406400 nb pkts 1880 rcv 590 rx rate 2406400
> >> >>> nb pkts 1880 rcv 591 rx rate 2406400 nb pkts 1880 rcv 592 rx rate
> >> >>> 2398720 nb pkts 1874 rcv 593 rx rate 2400000 nb pkts 1875 rcv 594
> >> >>> rx rate 2400000 nb pkts 1875 rcv 595 rx rate 2400000 nb pkts 1875
> >> >>> rcv
> >> >>> 596 rx rate 2401280 nb pkts 1876 rcv 597 rx rate 2401280 nb pkts
> >> >>> 1876 rcv 598 rx rate 2401280 nb pkts 1876 rcv 599 rx rate 2402560
> >> >>> nb pkts 1877 rx rate sum 3156416000
> >> >>
> >> >>
> >> >>
> >> >>>>> ... despite that there is _NO_ congestion...
> >> >>>>> congestion at the subport or pipe.
> >> >>>>>> And the subport !! doesn't use about 42 mbit/s of available
> >> >>>>>> bandwidth.
> >> >>>>>> The only difference is those test configurations is TC of
> >> >>>>>> generated traffic.
> >> >>>>>> Test 1 uses TC 1 while test 2 uses TC 3 (which is use TC_OV
> >> >>>>>> function).
> >> >>>>>> So, enabling TC_OV changes the results dramatically.
> >> >>>>>> ##
> >> >>>>>> ## test1
> >> >>>>>> ##
> >> >>>>>> hqos add profile  7 rate    2 M size 1000000 tc period 40
> >> >>>>>> # qos test port
> >> >>>>>> hqos add port 1 rate 10 G mtu 1522 frame overhead 24 queue
> >> >>>>>> sizes
> >> >>>>>> 64 64 64 64
> >> >>>>>> hqos add port 1 subport 0 rate 300 M size 1000000 tc period 10
> >> >>>>>> hqos add port 1 subport 0 pipes 2000 profile 7 hqos add port 1
> >> >>>>>> subport 0 pipes 200 profile 23 hqos set port 1 lcore 3 port 1
> >> >>>>>> subport rate 300 M number of tx flows 300 generator tx rate 1M
> >> >>>>>> TC
> >> >>>>>> 1 ...
> >> >>>>>> rcv 284 rx rate 995840  nb pkts 778 rcv 285 rx rate 995840  nb
> >> >>>>>> pkts 778 rcv 286 rx rate 995840  nb pkts 778 rcv 287 rx rate
> >> >>>>>> 995840  nb pkts 778 rcv 288 rx rate 995840  nb pkts 778 rcv
> >> >>>>>> 289 rx rate 995840  nb pkts 778 rcv 290 rx rate 995840  nb
> >> >>>>>> pkts 778 rcv 291 rx rate 995840  nb pkts 778 rcv 292 rx rate
> >> >>>>>> 995840  nb pkts 778 rcv 293 rx rate 995840  nb pkts 778 rcv
> >> >>>>>> 294 rx rate
> >> >>>>>> 995840  nb pkts 778 ...
> >> >>>>>> sum pipe's rx rate is 298 494 720 OK.
> >> >>>>>> The subport rate is equally distributed to 300 pipes.
> >> >>>>>> ##
> >> >>>>>> ##  test 2
> >> >>>>>> ##
> >> >>>>>> hqos add profile  7 rate    2 M size 1000000 tc period 40
> >> >>>>>> # qos test port
> >> >>>>>> hqos add port 1 rate 10 G mtu 1522 frame overhead 24 queue
> >> >>>>>> sizes
> >> >>>>>> 64 64 64 64
> >> >>>>>> hqos add port 1 subport 0 rate 300 M size 1000000 tc period 10
> >> >>>>>> hqos add port 1 subport 0 pipes 2000 profile 7 hqos add port 1
> >> >>>>>> subport 0 pipes 200 profile 23 hqos set port 1 lcore 3 port 1
> >> >>>>>> subport rate 300 M number of tx flows 300 generator tx rate 1M
> >> >>>>>> TC
> >> >>>>>> 3
> >> >>>>>> h5 ~ # rcli sh qos rcv
> >> >>>>>> rcv 0   rx rate 875520  nb pkts 684
> >> >>>>>> rcv 1   rx rate 856320  nb pkts 669
> >> >>>>>> rcv 2   rx rate 849920  nb pkts 664
> >> >>>>>> rcv 3   rx rate 853760  nb pkts 667
> >> >>>>>> rcv 4   rx rate 867840  nb pkts 678
> >> >>>>>> rcv 5   rx rate 844800  nb pkts 660
> >> >>>>>> rcv 6   rx rate 852480  nb pkts 666
> >> >>>>>> rcv 7   rx rate 855040  nb pkts 668
> >> >>>>>> rcv 8   rx rate 865280  nb pkts 676
> >> >>>>>> rcv 9   rx rate 846080  nb pkts 661
> >> >>>>>> rcv 10  rx rate 858880  nb pkts 671 rcv 11  rx rate 870400  nb
> >> >>>>>> pkts 680 rcv 12  rx rate 864000  nb pkts 675 rcv 13  rx rate
> >> >>>>>> 852480  nb pkts 666 rcv 14  rx rate 855040  nb pkts 668 rcv 15
> >> >>>>>> rx rate 857600  nb pkts 670 rcv 16  rx rate 864000  nb pkts
> >> >>>>>> 675 rcv 17  rx rate 866560  nb pkts 677 rcv 18  rx rate 865280
> >> >>>>>> nb pkts 676 rcv 19  rx rate 858880  nb pkts 671 rcv 20  rx
> >> >>>>>> rate
> >> >>>>>> 856320  nb pkts 669 rcv 21  rx rate 864000  nb pkts 675 rcv 22
> >> >>>>>> rx rate 869120  nb pkts 679 rcv 23  rx rate 856320  nb pkts
> >> >>>>>> 669 rcv 24  rx rate 862720  nb pkts 674 rcv 25  rx rate 865280
> >> >>>>>> nb pkts 676 rcv 26  rx rate 867840  nb pkts 678 rcv 27  rx
> >> >>>>>> rate
> >> >>>>>> 870400  nb pkts 680 rcv 28  rx rate 860160  nb pkts 672 rcv 29
> >> >>>>>> rx rate 870400  nb pkts 680 rcv 30  rx rate 869120  nb pkts
> >> >>>>>> 679 rcv 31  rx rate 870400  nb pkts 680 rcv 32  rx rate 858880
> >> >>>>>> nb pkts 671 rcv 33  rx rate 858880  nb pkts 671 rcv 34  rx
> >> >>>>>> rate
> >> >>>>>> 852480  nb pkts 666 rcv 35  rx rate 874240  nb pkts 683 rcv 36
> >> >>>>>> rx rate 855040  nb pkts 668 rcv 37  rx rate 853760  nb pkts
> >> >>>>>> 667 rcv 38  rx rate 869120  nb pkts 679 rcv 39  rx rate 885760
> >> >>>>>> nb pkts 692 rcv 40  rx rate 861440  nb pkts 673 rcv 41  rx
> >> >>>>>> rate
> >> >>>>>> 852480  nb pkts 666 rcv 42  rx rate 871680  nb pkts 681 ...
> >> >>>>>> ...
> >> >>>>>> rcv 288 rx rate 766720  nb pkts 599 rcv 289 rx rate 766720  nb
> >> >>>>>> pkts 599 rcv 290 rx rate 766720  nb pkts 599 rcv 291 rx rate
> >> >>>>>> 766720  nb pkts 599 rcv 292 rx rate 762880  nb pkts 596 rcv
> >> >>>>>> 293 rx rate 762880  nb pkts 596 rcv 294 rx rate 762880  nb
> >> >>>>>> pkts 596 rcv 295 rx rate 760320  nb pkts 594 rcv 296 rx rate
> >> >>>>>> 604160  nb pkts 472 rcv 297 rx rate 604160  nb pkts 472 rcv
> >> >>>>>> 298 rx rate
> >> >>>>>> 604160  nb pkts 472 rcv 299 rx rate 604160  nb pkts 472 rx
> >> >>>>>> rate sum 258839040 FAILED.
> >> >>>>>> The subport rate is distributed NOT equally between 300 pipes.
> >> >>>>>> Some subport bandwith (about 42) is not being used!