https://bugzilla.suse.com/show_bug.cgi?id=1203603 https://bugzilla.suse.com/show_bug.cgi?id=1203603#c1 Jiri Wiesner <jwiesner@suse.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |IN_PROGRESS --- Comment #1 from Jiri Wiesner <jwiesner@suse.com> --- It should be noted that moving both the client and the server iperf3 process to NUMA node 0 causes a performance hit, which is not as pronounced as in the TCP test:
simba3:~/:[1]# taskset 0x0000ffff /root/jwiesner/iperf/src/iperf3 -u -c 10.100.128.66 -P1 -f m -b 0 -t 180 -i 5 -O 2 Connecting to host 10.100.128.66, port 5201 [ 5] local 10.100.128.68 port 42650 connected to 10.100.128.66 port 5201 [ ID] Interval Transfer Bitrate Total Datagrams [ 5] 0.00-5.00 sec 4.15 GBytes 7121 Mbits/sec 3829980 [ 5] 5.00-10.00 sec 4.14 GBytes 7114 Mbits/sec 3070640 [ 5] 10.00-15.00 sec 4.15 GBytes 7129 Mbits/sec 3076920
The MTU of all devices was set to 1500 bytes. This is nstat output for a 10 second period on simba2 for the UDP test:
IpInReceives 7951006 0.0 IpInDelivers 7950996 0.0 IpOutRequests 2 0.0 TcpInSegs 2 0.0 TcpOutSegs 2 0.0 UdpInDatagrams 7078508 0.0 UdpInErrors 872514 0.0 UdpRcvbufErrors 872514 0.0 Ip6InReceives 16 0.0 Ip6InMcastPkts 16 0.0 Ip6InOctets 1422 0.0 Ip6InMcastOctets 1422 0.0 Ip6InNoECTPkts 16 0.0 TcpExtTCPHPAcks 2 0.0 TcpExtTCPAutoCorking 1 0.0 TcpExtTCPOrigDataSent 2 0.0 TcpExtTCPDelivered 2 0.0 IpExtInOctets 11735864062 0.0 IpExtOutOctets 1432 0.0 IpExtInNoECTPkts 7951140 0.0 The same output for the TCP test: IpInReceives 1812332 0.0 IpInDelivers 1812320 0.0 IpOutRequests 496318 0.0 TcpInSegs 1812324 0.0 TcpOutSegs 496319 0.0 Ip6InReceives 13 0.0 Ip6InMcastPkts 13 0.0 Ip6InOctets 1115 0.0 Ip6InMcastOctets 1115 0.0 Ip6InNoECTPkts 13 0.0 TcpExtTCPHPHits 1812243 0.0 TcpExtTCPPureAcks 7 0.0 TcpExtTCPHPAcks 4 0.0 TcpExtTCPAutoCorking 1 0.0 TcpExtTCPOrigDataSent 10 0.0 TcpExtTCPDelivered 11 0.0 IpExtInOctets 116209437656 0.0 IpExtOutOctets 25809812 0.0 IpExtInNoECTPkts 80194342 0.0 The IP layer in the UDP test processes MTU-sized packets: 11735864062 (IpExtInOctets) / 7950996 (IpInDelivers) = 1476 bytes per packet whereas IP layer in the TCP test processes much larger packets approaching the maximum size of an IP packet: 116209437656 (IpExtInOctets) / 1812320 (IpInDelivers) = 64121 bytes per packet
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