[dpdk-dev] [Bug 674] [dpdk-21.05] nic_single_core_perf/test_perf_nic_single_core_avx2: Throughput dropped about 8% when ues send 64 byte packets on 1C2T cores config.

[bugzilla@dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=674

            Bug ID: 674
           Summary: [dpdk-21.05]
                    nic_single_core_perf/test_perf_nic_single_core_avx2:
                    Throughput dropped about 8% when ues send 64 byte
                    packets on 1C2T cores config.
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: testpmd
          Assignee: dev@dpdk.org
          Reporter: weix.ling@intel.com
  Target Milestone: ---

Description

DPDK version: 
 21.05.0-rc0 4113ddd45293d7b26ff4033bfd86cef03d29124f
Other software versions: N/A.
OS: Ubuntu 20.04.2 LTS/Linux 5.8.0-48-generic
Compiler: gcc version 10.2.0 (Ubuntu 10.2.0-5ubuntu1~20.04)
Hardware platform: Intel(R) Xeon(R) Platinum 8280M CPU @ 2.70GHz.
NIC hardware: Ethernet Controller E810-C for QSFP 1592.
NIC firmware: 2.30 0x80004dd0 1.2839.0
NIC driver: ice-0.8.2-k

Test Setup
Steps to reproduce
List the steps to reproduce the issue.

1.Bind NIC to DPDK
usertools/dpdk-devbind.py --force --bind=vfio-pci 0000:18:00.0

2.Compile DPDK
rm -rf x86_64-native-linuxapp-gcc
CC=gcc meson -Denable_kmods=True -Dlibdir=lib  --default-library=static
x86_64-native-linuxapp-gcc
ninja -C x86_64-native-linuxapp-gcc -j 32

3.Start testpmd
x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 5,6,62 -n 6 
--file-prefix=dpdk_2066596_20210413175519  --force-max-simd-bitwidth=256  -a
0000:18:00.0 -- -i --portmask=0x1 --rxq=2 --txq=2 --txd=1024 --rxd=1024
--nb-cores=2
show port info all
start

4.Use IXIA to sent IP packets
[Ether(src="52:00:00:00:00:00")/IP(src="1.2.3.4",dst="192.18.1.0")/("X"*26)]

5.Get the Throughput on 1C/2T cores, 64Byte framesize 1024 TXD/RXD config.
Show the output from the previous commands.

+----------+------------+---------+-------------+---------+---------------------+-----------------------+
| Fwd_core | Frame Size | TXD/RXD | Throughput  |  Rate   | Expected Throughput
| Throughput Difference |
+==========+============+=========+=============+=========+=====================+=======================+
| 1C/1T    | 64         | 1024    | 77.595 Mpps | 52.144% | 76.069 Mpps        
| 1.526 Mpps            |
+----------+------------+---------+-------------+---------+---------------------+-----------------------+
| 1C/1T    | 128        | 1024    | 76.071 Mpps | 90.068% | 75.420 Mpps        
| 0.651 Mpps            |
+----------+------------+---------+-------------+---------+---------------------+-----------------------+
| 1C/2T    | 64         | 1024    | 88.346 Mpps | 59.369% | 90.638 Mpps        
| -2.292 Mpps           |
+----------+------------+---------+-------------+---------+---------------------+-----------------------+
| 1C/2T    | 128        | 1024    | 74.002 Mpps | 87.619% | 73.972 Mpps        
| 0.030 Mpps            |
+----------+------------+---------+-------------+---------+---------------------+-----------------------+
Expected Result
Explain what is the expected result in text or as an example output:

+----------+------------+---------+-------------+---------+---------------------+-----------------------+
| Fwd_core | Frame Size | TXD/RXD | Throughput  |  Rate   | Expected Throughput
| Throughput Difference |
+==========+============+=========+=============+=========+=====================+=======================+
| 1C/1T    | 64         | 1024    | 75.834 Mpps | 50.961% | 76.069 Mpps        
| -0.235 Mpps           |
+----------+------------+---------+-------------+---------+---------------------+-----------------------+
| 1C/1T    | 128        | 1024    | 74.528 Mpps | 88.241% | 75.420 Mpps        
| -0.892 Mpps           |
+----------+------------+---------+-------------+---------+---------------------+-----------------------+
| 1C/2T    | 64         | 1024    | 96.322 Mpps | 64.728% | 90.638 Mpps        
| 5.684 Mpps            |
+----------+------------+---------+-------------+---------+---------------------+-----------------------+
| 1C/2T    | 128        | 1024    | 74.178 Mpps | 87.827% | 73.972 Mpps        
| 0.206 Mpps            |
+----------+------------+---------+-------------+---------+---------------------+-----------------------+
Regression
Is this issue a regression: (Y/N) Y

Version the regression was introduced: 

Bad commit:

commit 3d2913c67c83cca05a009ebbca3d11a5586d6117
Author: Tal Shnaiderman <talshn@nvidia.com>
Date: Tue Mar 16 15:28:18 2021 +0200

eal: add error numbers in thread TLS API

Add error number reporting to rte_errno in all
functions in the rte_thread_tls_* API.

Suggested-by: Anatoly Burakov <anatoly.burakov@intel.com>
Signed-off-by: Tal Shnaiderman <talshn@nvidia.com>
Acked-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>

Stack Trace or Log
CPU info:
root@dpdk-xuemin4x-cvl100g:~/dpdk# usertools/cpu_layout.py
======================================================================
Core and Socket Information (as reported by '/sys/devices/system/cpu')
======================================================================cores = 
[0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 24,
25, 26, 27, 28, 29, 30]
sockets =  [0, 1]        Socket 0          Socket 1
        --------          --------
Core 0  [0, 56]           [28, 84]
Core 1  [1, 57]           [29, 85]
Core 2  [2, 58]           [30, 86]
Core 3  [3, 59]           [31, 87]
Core 4  [4, 60]           [32, 88]
Core 5  [5, 61]           [33, 89]
Core 6  [6, 62]           [34, 90]
Core 8  [7, 63]           [35, 91]
Core 9  [8, 64]           [36, 92]
Core 10 [9, 65]           [37, 93]
Core 11 [10, 66]          [38, 94]
Core 12 [11, 67]          [39, 95]
Core 13 [12, 68]          [40, 96]
Core 14 [13, 69]          [41, 97]
Core 16 [14, 70]          [42, 98]
Core 17 [15, 71]          [43, 99]
Core 18 [16, 72]          [44, 100]
Core 19 [17, 73]          [45, 101]
Core 20 [18, 74]          [46, 102]
Core 21 [19, 75]          [47, 103]
Core 22 [20, 76]          [48, 104]
Core 24 [21, 77]          [49, 105]
Core 25 [22, 78]          [50, 106]
Core 26 [23, 79]          [51, 107]
Core 27 [24, 80]          [52, 108]
Core 28 [25, 81]          [53, 109]
Core 29 [26, 82]          [54, 110]
Core 30 [27, 83]          [55, 111]

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