On Tue, May 19, 2020 at 07:05:34PM +0200, Matteo Croce wrote: > On Tue, 19 May 2020 12:05:20 +0200 > Matteo Croce <mcr...@redhat.com> wrote: > > Hi, > > The patch seems to work. I'm generating traffic with random MAC and IP > addresses, to have many flows: > > # tcpdump -tenni eth2 > 9a:a9:b1:3a:b1:6b > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: > 10.0.0.4.0 > 192.168.0.4.0: UDP, length 12 > 9e:92:fd:f8:7f:0a > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: > 10.0.0.4.0 > 192.168.0.4.0: UDP, length 12 > 66:b7:11:8a:c2:1f > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: > 10.0.0.1.0 > 192.168.0.1.0: UDP, length 12 > 7a:ba:58:bd:9a:62 > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: > 10.0.0.1.0 > 192.168.0.1.0: UDP, length 12 > 7e:78:a9:97:70:3a > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: > 10.0.0.2.0 > 192.168.0.2.0: UDP, length 12 > b2:81:91:34:ce:42 > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: > 10.0.0.2.0 > 192.168.0.2.0: UDP, length 12 > 2a:05:52:d0:d9:3f > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: > 10.0.0.3.0 > 192.168.0.3.0: UDP, length 12 > ee:ee:47:35:fa:81 > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: > 10.0.0.3.0 > 192.168.0.3.0: UDP, length 12 > > This is the default rate, with rxhash off: > > # utraf eth2 > tx: 0 bps 0 pps rx: 397.4 Mbps 827.9 Kpps > tx: 0 bps 0 pps rx: 396.3 Mbps 825.7 Kpps > tx: 0 bps 0 pps rx: 396.6 Mbps 826.3 Kpps > tx: 0 bps 0 pps rx: 396.5 Mbps 826.1 Kpps > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 9 root 20 0 0 0 0 R 99.7 0.0 7:02.58 > ksoftirqd/0 > 15 root 20 0 0 0 0 S 0.0 0.0 0:00.00 > ksoftirqd/1 > 20 root 20 0 0 0 0 S 0.0 0.0 2:01.48 > ksoftirqd/2 > 25 root 20 0 0 0 0 S 0.0 0.0 0:32.86 > ksoftirqd/3 > > and this with rx hashing enabled: > > # ethtool -K eth2 rxhash on > # utraf eth2 > tx: 0 bps 0 pps rx: 456.4 Mbps 950.8 Kpps > tx: 0 bps 0 pps rx: 458.4 Mbps 955.0 Kpps > tx: 0 bps 0 pps rx: 457.6 Mbps 953.3 Kpps > tx: 0 bps 0 pps rx: 462.2 Mbps 962.9 Kpps > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 20 root 20 0 0 0 0 R 0.7 0.0 2:02.34 > ksoftirqd/2 > 25 root 20 0 0 0 0 S 0.3 0.0 0:33.25 > ksoftirqd/3 > 9 root 20 0 0 0 0 S 0.0 0.0 7:52.57 > ksoftirqd/0 > 15 root 20 0 0 0 0 S 0.0 0.0 0:00.00 > ksoftirqd/1 > > > The throughput doesn't increase so much, maybe we hit an HW limit of > the gigabit port. The interesting thing is how the global CPU usage > drops from 25% to 1%. > I can't explain this, it could be due to the reduced contention?
Hi Matteo, Can I take that as a Tested-by ? Thanks. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC for 0.8m (est. 1762m) line in suburbia: sync at 13.1Mbps down 424kbps up
