Date: Tue, 22 Jul 2014 11:18:53 -0400 From: John Jasen <jjasen@gmail.com> To: FreeBSD Net <freebsd-net@freebsd.org> Subject: fastforward/routing: a 3 million packet-per-second system? Message-ID: <53CE80DD.9090109@gmail.com>
next in thread | raw e-mail | index | archive | help
Feedback and/or tips and tricks more than welcome. Outstanding questions: Would increasing the number of processor cores help? Would a system where both processor QPI ports connect to each other mitigate QPI bottlenecks? Are there further performance optimizations I am missing? Server Description: The system in question is a Dell Poweredge R820, 16GB of RAM, and two Intel(R) Xeon(R) CPU E5-4610 0 @ 2.40GHz. Onboard, in a 16x PCIe slot, I have one Chelsio T-580-CR two-port 40GbE NIC, and in an 8x slot, another T-580-CR dual port. I am running FreeBSD 10.0-STABLE. BIOS tweaks: Hyperthreading (or Logical Processors) is turned off. Memory Node Interleaving is turned off, but did not appear to impact performance. /boot/loader.conf contents: #for CARP+PF testing carp_load="YES" #load cxgbe drivers. cxgbe_load="YES" #maxthreads appears to not exceed CPU. net.isr.maxthreads=12 #bindthreads may be indicated when using cpuset(1) on interrupts net.isr.bindthreads=1 #random guess based on googling net.isr.maxqlimit=60480 net.link.ifqmaxlen=90000 #discussions with cxgbe maintainer and list led me to trying this. Allows more interrupts #to be fixed to CPUs, which in some cases, improves interrupt balancing. hw.cxgbe.ntxq10g=16 hw.cxgbe.nrxq10g=16 /etc/sysctl.conf contents: #the following is also enabled by rc.conf gateway_enable. net.inet.ip.fastforwarding=1 #recommendations from BSD router project kern.random.sys.harvest.ethernet=0 kern.random.sys.harvest.point_to_point=0 kern.random.sys.harvest.interrupt=0 #probably should be removed, as cxgbe does not seem to affect/be affected by irq storm settings hw.intr_storm_threshold=25000000 #based on Calomel.Org performance suggestions. 4x40GbE, seemed reasonable to use 100GbE settings kern.ipc.maxsockbuf=1258291200 net.inet.tcp.recvbuf_max=1258291200 net.inet.tcp.sendbuf_max=1258291200 #attempting to play with ULE scheduler, making it serve packets versus netstat kern.sched.slice=1 kern.sched.interact=1 /etc/rc.conf contains: hostname="fbge1" #should remove, especially given below duplicate entry ifconfig_igb0="DHCP" sshd_enable="YES" #ntpd_enable="YES" # Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable dumpdev="AUTO" # OpenBSD PF options to play with later. very bad for raw packet rates. #pf_enable="YES" #pflog_enable="YES" # enable packet forwarding # these enable forwarding and fastforwarding sysctls. inet6 does not have fastforward gateway_enable="YES" ipv6_gateway_enable="YES" # enable OpenBSD ftp-proxy # should comment out until actively playing with PF ftpproxy_enable="YES" #left in place, commented out from prior testing #ifconfig_mlxen1="inet 172.16.2.1 netmask 255.255.255.0 mtu 9000" #ifconfig_mlxen0="inet 172.16.1.1 netmask 255.255.255.0 mtu 9000" #ifconfig_mlxen3="inet 172.16.7.1 netmask 255.255.255.0 mtu 9000" #ifconfig_mlxen2="inet 172.16.8.1 netmask 255.255.255.0 mtu 9000" # -lro and -tso options added per mailing list suggestion from Bjoern A. Zeeb (bzeeb-lists at lists.zabbadoz.net) ifconfig_cxl0="inet 172.16.3.1 netmask 255.255.255.0 mtu 9000 -lro -tso up" ifconfig_cxl1="inet 172.16.4.1 netmask 255.255.255.0 mtu 9000 -lro -tso up" ifconfig_cxl2="inet 172.16.5.1 netmask 255.255.255.0 mtu 9000 -lro -tso up" ifconfig_cxl3="inet 172.16.6.1 netmask 255.255.255.0 mtu 9000 -lro -tso up" # aliases instead of reconfiguring test clients. See above commented out entries ifconfig_cxl0_alias0="172.16.7.1 netmask 255.255.255.0" ifconfig_cxl1_alias0="172.16.8.1 netmask 255.255.255.0" ifconfig_cxl2_alias0="172.16.1.1 netmask 255.255.255.0" ifconfig_cxl3_alias0="172.16.2.1 netmask 255.255.255.0" # for remote monitoring/admin of the test device ifconfig_igb0="inet 172.30.60.60 netmask 255.255.0.0" Additional configurations: cpuset-chelsio-6cpu-high # Original provided by Navdeep Parhar <nparhar@gmail.com> # takes vmstat -ai output into a list, and assigns interrupts in order to # the available CPU cores. # Modified: to assign only to the 'high CPUs', ie: on core1. # See: http://lists.freebsd.org/pipermail/freebsd-net/2014-July/039317.html #!/usr/local/bin/bash ncpu=12 irqlist=$(vmstat -ia | egrep 't4nex|t5nex|cxgbc' | cut -f1 -d: | cut -c4-) i=6 for irq in $irqlist; do cpuset -l $i -x $irq i=$((i+1)) [ $i -ge $ncpu ] && i=6 done Client Description: Two Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz processors 64 GB ram Mellanox Technologies MT27500 Family [ConnectX-3] Centos 6.4 with updates iperf3 installed from yum repositories: iperf3-3.0.3-3.el6.x86_64 Test setup: I've found about 3 streams between Centos clients is about the best way to get the most out of them. Above certain points, the -b flag does not change results. -N is an artifact from using TCP -l is needed, as -M doesn't work for UDP. I usually use launch scripts similar to the following: for i in `seq 41 60`; do ssh loader$i "export TIME=120; export STREAMS=1; export PORT=52$i; export PKT=64; export RATE=2000m; /root/iperf-test-8port-udp" & done The scripts execute the following on each host. #!/bin/bash PORT1=$PORT PORT2=$(($PORT+1000)) PORT3=$(($PORT+2000)) iperf3 -c loader41-40gbe -u -b 10000m -i 0 -N -l $PKT -t$TIME -P$STREAMS -p$PORT1 & iperf3 -c loader42-40gbe -u -b 10000m -i 0 -N -l $PKT -t$TIME -P$STREAMS -p$PORT1 & iperf3 -c loader43-40gbe -u -b 10000m -i 0 -N -l $PKT -t$TIME -P$STREAMS -p$PORT1 & ... (through all clients and all three ports) ... iperf3 -c loader60-40gbe -u -b 10000m -i 0 -N -l $PKT -t$TIME -P$STREAMS -p$PORT3 & Results: Summarized, netstat -w 1 -q 240 -bd, run through: cat test4-tuning | egrep -v {'packets | input '} | awk '{ipackets+=$1} {idrops+=$3} {opackets+=$5} {odrops+=$9} END {print "input " ipackets/NR, "idrops " idrops/NR, "opackets " opackets/NR, "odrops " odrops/NR}' input 1.10662e+07 idrops 8.01783e+06 opackets 3.04516e+06 odrops 3152.4 Snapshot of raw output: input (Total) output packets errs idrops bytes packets errs bytes colls drops 11189148 0 7462453 1230805216 3725006 0 409750710 0 799 10527505 0 6746901 1158024978 3779096 0 415700708 0 127 10606163 0 6850760 1166676673 3751780 0 412695761 0 1535 10749324 0 7132014 1182425799 3617558 0 397930956 0 5972 10695667 0 7022717 1176521907 3669342 0 403627236 0 1461 10441173 0 6762134 1148528662 3675048 0 404255540 0 6021 10683773 0 7005635 1175215014 3676962 0 404465671 0 2606 10869859 0 7208696 1195683372 3658432 0 402427698 0 979 11948989 0 8310926 1314387881 3633773 0 399714986 0 725 12426195 0 8864415 1366877194 3562311 0 391853156 0 2762 13006059 0 9432389 1430661751 3570067 0 392706552 0 5158 12822243 0 9098871 1410443600 3715177 0 408668500 0 4064 13317864 0 9683602 1464961374 3632156 0 399536131 0 3684 13701905 0 10182562 1507207982 3523101 0 387540859 0 8690 13820227 0 10244870 1520221820 3562038 0 391823322 0 2426 14437060 0 10955483 1588073033 3480105 0 382810557 0 2619 14518471 0 11119573 1597028105 3397439 0 373717355 0 5691 14890287 0 11675003 1637926521 3199812 0 351978304 0 11007 14923610 0 11749091 1641594441 3171436 0 348857468 0 7389 14738704 0 11609730 1621254991 3117715 0 342948394 0 2597 14753975 0 11549735 1622935026 3207393 0 352812846 0 4798
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?53CE80DD.9090109>