virtio_pvp_regression: perf drop

https://bugs.dpdk.org/show_bug.cgi?id=1747

Bug ID: 1747
Summary: [dpdk-25.07] virtio_pvp_regression: perf drop
Product: DPDK
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: vhost/virtio
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---

[Environment]

DPDK version:
commit 20460dcffd08a4680f881c39916ae783ee830374 (HEAD -> main, tag: v25.07-rc2, origin/main, origin/HEAD)

Author: Thomas Monjalon <[email protected]>
Date:   Mon Jun 30 00:23:49 2025 +0200

version: 25.07-rc2

OS: Ubuntu 24.04.2 LTS (Noble Numbat); 6.8.0-62-generic
Compiler: gcc version 13.3.0 (Ubuntu 13.3.0-6ubuntu2~24.04) Hardware platform: Intel(R) Xeon(R) Platinum 8380 CPU @ 2.30GHz CPU @ 2.3GHz
QEMU: qemu-10.0.2
NIC: Ethernet Controller E810-C for QSFP 1592

[Bad commit Debug Info]:
3e3c7f3fa5 net/virtio: fix check of threshold for Tx freeing
[Test Setup]
Steps to reproduce
List the steps to reproduce the issue.

1, Build 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

2, Bind one NIC port and launch vhost-user usertools/dpdk-devbind.py --force --bind=vfio-pci 0000:4b:00.0 x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 5-7 -n 8 -a 0000:4b:00.0 --file-prefix=vhost_343434_20250703181552 --vdev 'eth_vhost0,iface=/root/dpdk/vhost-net,queues=2,client=1' -- -i --nb-cores=2 --rxq=2 --txq=2 --txd=1024 --rxd=1024
set fwd mac
start

3, Launch qemu and start testpmd
lsof -n -i:6000
taskset -c 20,21,22,23,24,25,26,27
/home/QEMU/qemu-10.0.2/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:10.239.252.245:6000-:22 -device
e1000,netdev=nttsip1 -chardev socket,id=char0,path=/root/dpdk/vhost-net,server
-netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=2 -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,mq=on,vectors=15 -cpu host -smp 8 -m 8192 -object
memory-backend-file,id=mem,size=8192M,mem-path=/dev/hugepages,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

IN VM:
echo 0 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages echo 1024 > /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages modprobe vfio
modprobe vfio-pci
echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode usertools/dpdk-devbind.py --force --bind=vfio-pci --noiommu-mode 0000:00:04.0 x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x7 -n 4 -- -i --enable-hw-vlan-strip --nb-cores=2 --rxq=2 --txq=2 --txd=1024 --rxd=1024 set fwd mac
start

4, Use trex to send pkgs Ether(dst="40:a6:b7:96:e4:00")/IP(src="192.168.4.1")/("X"*26)

5, on Vhost side check NIC statistics:
testpmd> show port stats all

[Actual Result]
testpmd> show port stats all

######################## NIC statistics for port 0 ########################
RX-packets: 1335228256 RX-missed: 3852467168 RX-bytes: 1257101091618
RX-errors: 0
RX-nombuf: 0
TX-packets: 1335227072 TX-errors: 0 TX-bytes: 922022159232

Throughput (since last show)

  Rx-pps:      2082875          Rx-bps:   8546636528
  Tx-pps:      2082875          Tx-bps:  10284137360

############################################################################

######################## NIC statistics for port 1 ########################
RX-packets: 1335227200 RX-missed: 0 RX-bytes: 2021533980800
RX-errors: 0
RX-nombuf: 0
TX-packets: 1335227392 TX-errors: 0 TX-bytes: 2021534271488

Throughput (since last show)

  Rx-pps:      2082875          Rx-bps:  25227789696
  Tx-pps:      2082875          Tx-bps:  25227789696

############################################################################
testpmd>

[Expect Result]
testpmd> show port stats all

######################## NIC statistics for port 0 ########################
RX-packets: 161121824 RX-missed: 290949041 RX-bytes: 684435274430
RX-errors: 0
RX-nombuf: 0
TX-packets: 161069126 TX-errors: 0 TX-bytes: 243858650692

Throughput (since last show)

  Rx-pps:      2880720          Rx-bps:  98209559280
  Tx-pps:      2880658          Tx-bps:  34890425968

############################################################################

######################## NIC statistics for port 1 ########################
RX-packets: 161069346 RX-missed: 0 RX-bytes: 243858989844
RX-errors: 0
RX-nombuf: 0
TX-packets: 161070988 TX-errors: 50004 TX-bytes: 243861475832

Throughput (since last show)

  Rx-pps:      2880737          Rx-bps:  34891493424
  Tx-pps:      2880737          Tx-bps:  34891493424

########

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