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Date: Thu, 17 Mar 2016 11:02:27 -0300
From: Patrick Boutilier <boutilpj@...et.ns.ca>
To: netdev@...r.kernel.org
Subject: Extreme slowness in IPIP tunnel when routing through kernel 3.18 and
later
I have an IPIP tunnel setup between two hosts in different buildings.
The Linux router they route through causes extreme slowness in the
tunnel when running kernels from 3.18 on . tcpdump shows many cksum
errors which don't show up in the 3.17 and earlier kernels. Speed goes
back to normal when rx-checksumming and tx-checksumming are turned off
using ethtool on the Linux router . Would this be an effect of bulk
network packet transmission that was introduced in 3.18 or some other issue?
eth2
driver: igb
version: 5.2.15-k
firmware-version: 1.5.1
bus-info: 0000:06:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no
eth6
driver: ixgbe
version: 3.19.1-k
firmware-version: 0x80000389
bus-info: 0000:41:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no
Example of cksum from tcpdump:
Flags [.], cksum 0x2237 (incorrect -> 0xbb02), seq 424119200:424120648,
ack 1, win 115, options [nop,nop,TS val 303173784 ecr 3971495454],
length 1448
Results of nuttcp test with rx-checksumming and tx-checksumming on:
Testing upload inside tunnel
0.0625 MB / 5.00 sec = 0.1048 Mbps 79 retrans
0.0625 MB / 5.00 sec = 0.1048 Mbps 59 retrans
0.0625 MB / 5.00 sec = 0.1049 Mbps 27 retrans
0.2096 MB / 16.11 sec = 0.1092 Mbps 0 %TX 0 %RX 186 retrans
0.47 msRTT
Testing download inside tunnel
0.5000 MB / 5.00 sec = 0.8389 Mbps 112 retrans
2.6250 MB / 5.00 sec = 4.4040 Mbps 412 retrans
0.8750 MB / 5.00 sec = 1.4680 Mbps 156 retrans
4.0243 MB / 15.48 sec = 2.1809 Mbps 0 %TX 0 %RX 705 retrans
0.47 msRTT
Testing upload outside tunnel
423.0000 MB / 5.00 sec = 709.4949 Mbps 275 retrans
442.0625 MB / 5.00 sec = 741.7008 Mbps 53 retrans
418.5625 MB / 5.00 sec = 702.1329 Mbps 133 retrans
1287.0080 MB / 15.08 sec = 715.9252 Mbps 1 %TX 30 %RX 461 retrans
0.43 msRTT
Testing download outside tunnel
552.4375 MB / 5.00 sec = 926.8347 Mbps 26 retrans
555.1875 MB / 5.00 sec = 931.4499 Mbps 17 retrans
553.0000 MB / 5.00 sec = 927.7802 Mbps 16 retrans
1664.2149 MB / 15.03 sec = 928.6737 Mbps 9 %TX 5 %RX 60 retrans 0.46
msRTT
Results of nuttcp test with rx-checksumming and tx-checksumming off:
Testing upload inside tunnel
440.0000 MB / 5.00 sec = 738.0112 Mbps 117 retrans
433.0000 MB / 5.00 sec = 726.4892 Mbps 135 retrans
447.9375 MB / 5.00 sec = 751.5714 Mbps 112 retrans
1321.0069 MB / 15.04 sec = 736.7213 Mbps 3 %TX 21 %RX 364 retrans
0.51 msRTT
Testing download inside tunnel
494.0625 MB / 5.00 sec = 828.8973 Mbps 335 retrans
471.0000 MB / 5.00 sec = 790.2050 Mbps 219 retrans
469.8750 MB / 5.00 sec = 788.3174 Mbps 220 retrans
1435.1875 MB / 15.00 sec = 802.4203 Mbps 89 %TX 12 %RX 774 retrans
0.46 msRTT
Testing upload outside tunnel
431.2500 MB / 5.00 sec = 723.2808 Mbps 33 retrans
446.3750 MB / 5.00 sec = 748.9268 Mbps 10 retrans
475.4375 MB / 5.00 sec = 797.7044 Mbps 0 retrans
1355.0834 MB / 15.06 sec = 754.6438 Mbps 1 %TX 33 %RX 43 retrans
0.53 msRTT
Testing download outside tunnel
424.8125 MB / 5.00 sec = 712.7061 Mbps 102 retrans
456.5625 MB / 5.00 sec = 765.9872 Mbps 80 retrans
454.0000 MB / 5.00 sec = 761.6935 Mbps 116 retrans
1335.7823 MB / 15.01 sec = 746.6959 Mbps 4 %TX 5 %RX 298 retrans
0.55 msRTT
View attachment "boutilpj.vcf" of type "text/x-vcard" (287 bytes)
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