[dpdk-users] scheduler issue

[Singh, Jasvinder]

<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;


> >
> >
> >
> >>> 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!