masayuki2009 commented on issue #7802:
URL: https://github.com/apache/nuttx/issues/7802#issuecomment-1341856827
@anchao
I noticed that similar performance regression happens with the virtnet (e.g.
`qemu-armv8a:netnsh`)
```
After applying net/l2/l3/l4: add support of iob offload
+ /home/ishikawa/opensource/QEMU/qemu-7.1/build/qemu-system-aarch64 -cpu
cortex-a53 -smp 4 -nographic -machine virt,virtualization=on,gic-version=3
-chardev stdio,id=con,mux=on -serial chardev:con -global
virtio-mmio.force-legacy=false -netdev
user,id=u1,hostfwd=tcp:127.0.0.1:10023-10.0.2.15:23,hostfwd=tcp:127.0.0.1:15001-10.0.2.15:5001
-device virtio-net-device,netdev=u1,bus=virtio-mmio-bus.0 -mon
chardev=con,mode=readline -kernel ./nuttx
telnetd [4:100]
NuttShell (NSH) NuttX-10.4.0
nsh> uname -a
NuttX 10.4.0 34d2cde8a8 Dec 8 2022 10:40:53 arm64 qemu-armv8a
nsh> ps
PID GROUP PRI POLICY TYPE NPX STATE EVENT SIGMASK STACK
USED FILLED COMMAND
0 0 0 FIFO Kthread N-- Ready 00000000 008144
000976 11.9% Idle Task
1 1 192 RR Kthread --- Waiting Semaphore 00000000 008096
000960 11.8% hpwork 0x402d3428
2 2 100 RR Kthread --- Waiting Semaphore 00000000 008096
000960 11.8% lpwork 0x402d3458
3 3 100 RR Task --- Running 00000000 008112
002736 33.7% nsh_main
4 4 100 RR Task --- Waiting Semaphore 00000010 008112
001616 19.9% telnetd
nsh> iperf -c 43.31.77.50 -i 1 -t 10
IP: 10.0.2.15
mode=tcp-client sip=10.0.2.15:5001,dip=43.31.77.50:5001, interval=1, time=10
Interval Transfer Bandwidth
0.00- 1.01 sec 1769472 Bytes 14.02 Mbits/sec
1.01- 2.02 sec 3604480 Bytes 14.53 Mbits/sec
2.02- 3.03 sec 5455872 Bytes 14.66 Mbits/sec
3.03- 4.04 sec 7208960 Bytes 13.89 Mbits/sec
4.04- 5.05 sec 8929280 Bytes 13.63 Mbits/sec
5.05- 6.06 sec 10731520 Bytes 14.28 Mbits/sec
6.06- 7.07 sec 12582912 Bytes 14.66 Mbits/sec
7.07- 8.08 sec 14450688 Bytes 14.79 Mbits/sec
8.08- 9.09 sec 16302080 Bytes 14.66 Mbits/sec
9.09- 10.10 sec 18137088 Bytes 14.53 Mbits/sec
0.00- 10.10 sec 18137088 Bytes 14.37 Mbits/sec
iperf exit
```
```
Before applying net/l2/l3/l4: add support of iob offload
+ /home/ishikawa/opensource/QEMU/qemu-7.1/build/qemu-system-aarch64 -cpu
cortex-a53 -smp 4 -nographic -machine virt,virtualization=on,gic-version=3
-chardev stdio,id=con,mux=on -serial chardev:con -global
virtio-mmio.force-legacy=false -netdev
user,id=u1,hostfwd=tcp:127.0.0.1:10023-10.0.2.15:23,hostfwd=tcp:127.0.0.1:15001-10.0.2.15:5001
-device virtio-net-device,netdev=u1,bus=virtio-mmio-bus.0 -mon
chardev=con,mode=readline -kernel ./nuttx
telnetd [4:100]
NuttShell (NSH) NuttX-10.4.0
nsh> ps
PID GROUP PRI POLICY TYPE NPX STATE EVENT SIGMASK STACK
USED FILLED COMMAND
0 0 0 FIFO Kthread N-- Ready 00000000 008144
000976 11.9% Idle Task
1 1 192 RR Kthread --- Waiting Semaphore 00000000 008096
000960 11.8% hpwork 0x402d3428
2 2 100 RR Kthread --- Waiting Semaphore 00000000 008096
000960 11.8% lpwork 0x402d3458
3 3 100 RR Task --- Running 00000000 008112
002736 33.7% nsh_main
4 4 100 RR Task --- Waiting Semaphore 00000010 008112
001616 19.9% telnetd
nsh> iperf -c 43.31.77.50 -i 1 -t 10
IP: 10.0.2.15
mode=tcp-client sip=10.0.2.15:5001,dip=43.31.77.50:5001, interval=1, time=10
Interval Transfer Bandwidth
0.00- 1.01 sec 31866880 Bytes 252.41 Mbits/sec
1.01- 2.02 sec 65421312 Bytes 265.78 Mbits/sec
2.02- 3.03 sec 98975744 Bytes 265.78 Mbits/sec
3.03- 4.04 sec 129941504 Bytes 245.27 Mbits/sec
4.04- 5.05 sec 162316288 Bytes 256.43 Mbits/sec
5.05- 6.06 sec 192970752 Bytes 242.81 Mbits/sec
6.06- 7.07 sec 223592448 Bytes 242.55 Mbits/sec
7.07- 8.08 sec 256802816 Bytes 263.05 Mbits/sec
8.08- 9.09 sec 290242560 Bytes 264.87 Mbits/sec
9.09- 10.10 sec 323715072 Bytes 265.13 Mbits/sec
0.00- 10.10 sec 323715072 Bytes 256.41 Mbits/sec
iperf exit
```
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