[Bug 1212] [dpdk-21.11.8]pvp_qemu_multi_paths_port_restart:perf_pvp_qemu_vector_rx_mac: performance drop about 23.5% when send small packets

[bugzilla@dpdk.org]

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https://bugs.dpdk.org/show_bug.cgi?id=1212

            Bug ID: 1212
           Summary: [dpdk-21.11.8]pvp_qemu_multi_paths_port_restart:perf_p
                    vp_qemu_vector_rx_mac: performance drop about 23.5%
                    when send small packets
           Product: DPDK
           Version: 20.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: vhost/virtio
          Assignee: dev@dpdk.org
          Reporter: weix.ling@intel.com
  Target Milestone: ---

[Environment]

DPDK version: Use make showversion or for a non-released version: git remote -v
&& git show-ref --heads
 20.11.8-rc1
Other software versions: QEMU-7.0.0.
OS: Ubuntu 22.04.1 LTS/Linux 5.15.45-051545-generic
Compiler: gcc version 11.3.0 (Ubuntu 11.3.0-1ubuntu1~22.04)
Hardware platform: Intel(R) Xeon(R) Platinum 8280M CPU @ 2.70GHz
NIC hardware: Intel Ethernet Controller XL710 for 40GbE QSFP+ 1583
NIC firmware: i40e-2.22.18/9.20 0x8000d893 1.3353.0

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

1.Bind 1 NIC port to vfio-pci

dpdk-devbind.py --force --bind=vfio-pci 0000:af:00.0

2.Start vhost-user:

x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 28,29,30 -n 4 -a 0000:af:00.0 
--file-prefix=vhost_2352949_20230407162534  --vdev
'net_vhost0,iface=vhost-net,queues=1' -- -i --nb-cores=1 --txd=1024 --rxd=1024

testpmd>set fwd mac
testpmd>start

3.Start VM0 with QEMU-7.0.0

taskset -c 20,21,22,23,24,25,26,27 /home/QEMU/qemu-7.0.0/bin/qemu-system-x86_64
 -name vm0 -enable-kvm -pidfile /tmp/.vm0.pid -daemonize -monitor
unix:/tmp/vm0_monitor.sock,server,nowait -netdev
user,id=nttsip1,hostfwd=tcp:10.239.252.220:6000-:22 -device
e1000,netdev=nttsip1  -chardev socket,id=char0,path=./vhost-net -netdev
type=vhost-user,id=netdev0,chardev=char0,vhostforce -device
virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=true,mrg_rxbuf=off,rx_queue_size=1024,tx_queue_size=1024
-cpu host -smp 8 -m 16384 -object
memory-backend-file,id=mem,size=16384M,mem-path=/mnt/huge,share=on -numa
node,memdev=mem -mem-prealloc -chardev
socket,path=/tmp/vm0_qga0.sock,server,nowait,id=vm0_qga0 -device virtio-serial
-device virtserialport,chardev=vm0_qga0,name=org.qemu.guest_agent.0 -vnc :4
-drive file=/home/image/ubuntu2004.img

4.SSH VM0 and bind virtio-net to vfio-pci:

echo 0 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
echo 1024 >
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages
mkdir -p /mnt/huge
mount -t hugetlbfs nodev /mnt/hugemodprobe vfio-pci
echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
dpdk-devbind.py --force --bind=vfio-pci 0000:00:04.0

5.Start testpmd in VM0:

x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 3 -- -i --nb-cores=1
--txd=1024 --rxd=1024

testpmd>set fwd mac
testpmd>start

6.Use pktgen to send packets, and record the throughput.

Show the output from the previous commands.

+--------------+----------------------+------------------+------------+----------------+
| FrameSize(B) |         Mode         | Throughput(Mpps) | % linerate |    
Cycle      |
+==============+======================+==================+============+================+
| 64           | virtio0.95 vector_rx | 4.314            | 7.247      | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 128          | virtio0.95 vector_rx | 4.244            | 12.563     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 256          | virtio0.95 vector_rx | 4.576            | 25.262     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 512          | virtio0.95 vector_rx | 3.435            | 36.544     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 1024         | virtio0.95 vector_rx | 2.695            | 56.268     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 1280         | virtio0.95 vector_rx | 2.490            | 64.731     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 1518         | virtio0.95 vector_rx | 2.248            | 69.140     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+ 

[Expected Result]
Explain what is the expected result in text or as an example output:

+--------------+----------------------+------------------+------------+----------------+
| FrameSize(B) |         Mode         | Throughput(Mpps) | % linerate |    
Cycle      |
+==============+======================+==================+============+================+
| 64           | virtio0.95 vector_rx | 5.642            | 9.478      | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 128          | virtio0.95 vector_rx | 5.493            | 16.259     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 256          | virtio0.95 vector_rx | 5.004            | 27.620     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 512          | virtio0.95 vector_rx | 3.343            | 35.565     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 1024         | virtio0.95 vector_rx | 2.664            | 55.629     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 1280         | virtio0.95 vector_rx | 2.500            | 64.990     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+
| 1518         | virtio0.95 vector_rx | 2.309            | 71.028     | Before
Restart |
+--------------+----------------------+------------------+------------+----------------+ 
Regression
Is this issue a regression: (Y/N) Y

Version the regression was introduced: Specify git id if known.

Bad commit id:

commit abfe2cb0b40b3ceeb44df642c9d28a06bdfc9fb4 (HEAD)
Author: Luca Boccassi <bluca@debian.org>
Date:   Mon Nov 28 14:11:25 2022 +0000

    Revert "mempool: fix get objects from mempool with cache"

    As requested by the author

    This reverts commit 26cb4c81b552594292f7c744afb904f01700dfe8.

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