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Date: Thu, 16 Jul 2020 23:50:48 -0400
From: <qianshangshu.1997@...il.com>
To: <jeffrey.t.kirsher@...el.com>, <davem@...emloft.net>
Cc: <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: PROBLEM: [e1000e] 10% throughput drop on I219-LM after the buffer overrun fix even with TSO&GSO disabled
[1.] One line summary of the problem:
[e1000e] 10% throughput drop on I219-LM after the buffer overrun fix even
with TSO&GSO disabled
[2.] Full description of the problem/report:
With e1000e 3.6.2-k and 3.8.4-NAPI driver, which include the fix for the
buffer overrun problem
(https://github.com/torvalds/linux/commit/b10effb92e272051dd1ec0d7be56bf9ca8
5ab927, discussion: https://www.spinics.net/lists/netdev/msg460589.html),
I219-LM network card have a 10% throughput drop in the iperf3 test (with TSO
and GSO disabled) compared with the driver without such patch, and the
client is initiating the stream in such test (iperf3 client mode without -R
option). If the server is initiating the stream (with -R option in iperf3
client mode), the performance is not impacted.
That is to say, disabling TSO and GSO as suggested in that patch still have
performance impact on the TCP stream, and the throughput drops about 10%.
I tried to rollback the patch introduced to fix the buffer overrun problem
in the 3.8.4-NAPI driver, with TSO and GSO enabled, iperf3 test still cannot
max out my 1Gbps uplink. However, with TSO and GSO disabled, 1Gbps uplink
can be fully saturated.
I'll attach iperf3 test results for all these situations later in this
email.
[3.] Keywords
Network driver, e1000e
[4.] Kernel information
[4.1.] Kernel version (from /proc/version):
Linux version 5.4.0-31-generic (buildd@...01-amd64-059) (gcc version 9.3.0
(Ubuntu 9.3.0-10ubuntu2)) #35-Ubuntu SMP Thu May 7 20:20:34 UTC 2020
[4.2.] Kernel .config file:
https://kernel.ubuntu.com/~kernel-ppa/config/focal/linux/5.4.0-31.35/amd64-c
onfig.flavour.generic
[5.] Most recent kernel version which did not have the bug:
V4.14.2
[6.] Environment
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (2)
I219-LM (rev 31)
driver: e1000e
version: 3.2.6-k
firmware-version: 0.8-4
expansion-rom-version:
bus-info: 0000:00:1f.6
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no
iperf3:
iperf 3.7 (cJSON 1.5.2)
Linux Hetzner 5.4.0-31-generic #35-Ubuntu SMP Thu May 7 20:20:34 UTC 2020
x86_64 Optional features available: CPU affinity setting, IPv6 flow label,
SCTP, TCP congestion algorithm setting, sendfile / zerocopy, socket pacing,
authentication
[X.] Other notes, patches, fixes, workarounds:
3.6.2-k w/ TSO & GSO
iperf3 -c bouygues.iperf.fr -d -P 5
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 120 MBytes 101 Mbits/sec 0 sender
[ 5] 0.00-10.02 sec 119 MBytes 99.4 Mbits/sec
receiver
[ 7] 0.00-10.00 sec 120 MBytes 101 Mbits/sec 0 sender
[ 7] 0.00-10.02 sec 119 MBytes 99.4 Mbits/sec
receiver
[ 9] 0.00-10.00 sec 120 MBytes 101 Mbits/sec 0 sender
[ 9] 0.00-10.02 sec 119 MBytes 99.4 Mbits/sec
receiver
[ 11] 0.00-10.00 sec 120 MBytes 101 Mbits/sec 0 sender
[ 11] 0.00-10.02 sec 119 MBytes 99.5 Mbits/sec
receiver
[ 13] 0.00-10.00 sec 120 MBytes 101 Mbits/sec 0 sender
[ 13] 0.00-10.02 sec 119 MBytes 99.5 Mbits/sec
receiver
[SUM] 0.00-10.00 sec 601 MBytes 504 Mbits/sec 0 sender
[SUM] 0.00-10.02 sec 594 MBytes 497 Mbits/sec
receiver
iperf3 -c bouygues.iperf.fr -d -P 5 -R
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.02 sec 351 MBytes 293 Mbits/sec 134 sender
[ 5] 0.00-10.00 sec 344 MBytes 289 Mbits/sec
receiver
[ 7] 0.00-10.02 sec 204 MBytes 171 Mbits/sec 331 sender
[ 7] 0.00-10.00 sec 201 MBytes 168 Mbits/sec
receiver
[ 9] 0.00-10.02 sec 174 MBytes 146 Mbits/sec 226 sender
[ 9] 0.00-10.00 sec 171 MBytes 144 Mbits/sec
receiver
[ 11] 0.00-10.02 sec 177 MBytes 148 Mbits/sec 226 sender
[ 11] 0.00-10.00 sec 173 MBytes 145 Mbits/sec
receiver
[ 13] 0.00-10.02 sec 164 MBytes 138 Mbits/sec 229 sender
[ 13] 0.00-10.00 sec 161 MBytes 135 Mbits/sec
receiver
[SUM] 0.00-10.02 sec 1.04 GBytes 896 Mbits/sec 1146
sender
[SUM] 0.00-10.00 sec 1.03 GBytes 881 Mbits/sec
receiver
3.6.2-k w/o TSO & GSO
iperf3 -c bouygues.iperf.fr -d -P 5
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 190 MBytes 159 Mbits/sec 0 sender
[ 5] 0.00-10.02 sec 188 MBytes 157 Mbits/sec
receiver
[ 7] 0.00-10.00 sec 190 MBytes 160 Mbits/sec 0 sender
[ 7] 0.00-10.02 sec 188 MBytes 157 Mbits/sec
receiver
[ 9] 0.00-10.00 sec 191 MBytes 160 Mbits/sec 0 sender
[ 9] 0.00-10.02 sec 188 MBytes 158 Mbits/sec
receiver
[ 11] 0.00-10.00 sec 190 MBytes 160 Mbits/sec 0 sender
[ 11] 0.00-10.02 sec 188 MBytes 158 Mbits/sec
receiver
[ 13] 0.00-10.00 sec 191 MBytes 160 Mbits/sec 0 sender
[ 13] 0.00-10.02 sec 188 MBytes 157 Mbits/sec
receiver
[SUM] 0.00-10.00 sec 953 MBytes 799 Mbits/sec 0 sender
[SUM] 0.00-10.02 sec 940 MBytes 787 Mbits/sec
receiver
iperf3 -c bouygues.iperf.fr -d -P 5 -R
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.02 sec 256 MBytes 214 Mbits/sec 128 sender
[ 5] 0.00-10.00 sec 252 MBytes 211 Mbits/sec
receiver
[ 7] 0.00-10.02 sec 238 MBytes 199 Mbits/sec 119 sender
[ 7] 0.00-10.00 sec 234 MBytes 196 Mbits/sec
receiver
[ 9] 0.00-10.02 sec 166 MBytes 139 Mbits/sec 207 sender
[ 9] 0.00-10.00 sec 162 MBytes 136 Mbits/sec
receiver
[ 11] 0.00-10.02 sec 222 MBytes 186 Mbits/sec 316 sender
[ 11] 0.00-10.00 sec 219 MBytes 184 Mbits/sec
receiver
[ 13] 0.00-10.02 sec 225 MBytes 189 Mbits/sec 138 sender
[ 13] 0.00-10.00 sec 222 MBytes 186 Mbits/sec
receiver
[SUM] 0.00-10.02 sec 1.08 GBytes 927 Mbits/sec 908 sender
[SUM] 0.00-10.00 sec 1.06 GBytes 913 Mbits/sec
receiver
3.8.4-NAPI w/ TSO & GSO
iperf3 -c bouygues.iperf.fr -d -P 5
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 120 MBytes 100 Mbits/sec 0 sender
[ 5] 0.00-10.02 sec 117 MBytes 97.5 Mbits/sec
receiver
[ 7] 0.00-10.00 sec 115 MBytes 96.4 Mbits/sec 0 sender
[ 7] 0.00-10.02 sec 114 MBytes 95.1 Mbits/sec
receiver
[ 9] 0.00-10.00 sec 118 MBytes 98.9 Mbits/sec 0 sender
[ 9] 0.00-10.02 sec 117 MBytes 97.6 Mbits/sec
receiver
[ 11] 0.00-10.00 sec 118 MBytes 99.3 Mbits/sec 0 sender
[ 11] 0.00-10.02 sec 117 MBytes 97.5 Mbits/sec
receiver
[ 13] 0.00-10.00 sec 118 MBytes 99.3 Mbits/sec 0 sender
[ 13] 0.00-10.02 sec 116 MBytes 97.5 Mbits/sec
receiver
[SUM] 0.00-10.00 sec 589 MBytes 494 Mbits/sec 0 sender
[SUM] 0.00-10.02 sec 580 MBytes 485 Mbits/sec
receiver
iperf3 -c bouygues.iperf.fr -d -P 5 -R
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.02 sec 289 MBytes 241 Mbits/sec 187 sender
[ 5] 0.00-10.00 sec 282 MBytes 236 Mbits/sec
receiver
[ 7] 0.00-10.02 sec 355 MBytes 297 Mbits/sec 324 sender
[ 7] 0.00-10.00 sec 350 MBytes 293 Mbits/sec
receiver
[ 9] 0.00-10.02 sec 144 MBytes 121 Mbits/sec 239 sender
[ 9] 0.00-10.00 sec 141 MBytes 118 Mbits/sec
receiver
[ 11] 0.00-10.02 sec 136 MBytes 113 Mbits/sec 286 sender
[ 11] 0.00-10.00 sec 133 MBytes 111 Mbits/sec
receiver
[ 13] 0.00-10.02 sec 188 MBytes 157 Mbits/sec 156 sender
[ 13] 0.00-10.00 sec 185 MBytes 155 Mbits/sec
receiver
[SUM] 0.00-10.02 sec 1.09 GBytes 930 Mbits/sec 1192
sender
[SUM] 0.00-10.00 sec 1.06 GBytes 914 Mbits/sec
receiver
3.8.4-NAPI w/o TSO & GSO
iperf3 -c bouygues.iperf.fr -d -P 5
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 194 MBytes 163 Mbits/sec 0 sender
[ 5] 0.00-10.02 sec 192 MBytes 160 Mbits/sec
receiver
[ 7] 0.00-10.00 sec 194 MBytes 163 Mbits/sec 0 sender
[ 7] 0.00-10.02 sec 192 MBytes 160 Mbits/sec
receiver
[ 9] 0.00-10.00 sec 195 MBytes 163 Mbits/sec 0 sender
[ 9] 0.00-10.02 sec 192 MBytes 160 Mbits/sec
receiver
[ 11] 0.00-10.00 sec 195 MBytes 163 Mbits/sec 0 sender
[ 11] 0.00-10.02 sec 192 MBytes 160 Mbits/sec
receiver
[ 13] 0.00-10.00 sec 195 MBytes 163 Mbits/sec 0 sender
[ 13] 0.00-10.02 sec 192 MBytes 161 Mbits/sec
receiver
[SUM] 0.00-10.00 sec 973 MBytes 816 Mbits/sec 0 sender
[SUM] 0.00-10.02 sec 958 MBytes 802 Mbits/sec
receiver
iperf3 -c bouygues.iperf.fr -d -P 5 -R
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.02 sec 499 MBytes 418 Mbits/sec 1208
sender
[ 5] 0.00-10.00 sec 487 MBytes 409 Mbits/sec
receiver
[ 7] 0.00-10.02 sec 149 MBytes 125 Mbits/sec 262 sender
[ 7] 0.00-10.00 sec 146 MBytes 122 Mbits/sec
receiver
[ 9] 0.00-10.02 sec 158 MBytes 132 Mbits/sec 199 sender
[ 9] 0.00-10.00 sec 154 MBytes 129 Mbits/sec
receiver
[ 11] 0.00-10.02 sec 179 MBytes 149 Mbits/sec 209 sender
[ 11] 0.00-10.00 sec 175 MBytes 147 Mbits/sec
receiver
[ 13] 0.00-10.02 sec 128 MBytes 107 Mbits/sec 386 sender
[ 13] 0.00-10.00 sec 125 MBytes 105 Mbits/sec
receiver
[SUM] 0.00-10.02 sec 1.09 GBytes 931 Mbits/sec 2264
sender
[SUM] 0.00-10.00 sec 1.06 GBytes 912 Mbits/sec
receiver
3.8.4-NAPI w/ TSO & GSO (Without buffer overrun patch)
iperf3 -c bouygues.iperf.fr -d -P 5
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 204 MBytes 171 Mbits/sec 0 sender
[ 5] 0.00-10.02 sec 201 MBytes 169 Mbits/sec
receiver
[ 7] 0.00-10.00 sec 203 MBytes 170 Mbits/sec 0 sender
[ 7] 0.00-10.02 sec 201 MBytes 168 Mbits/sec
receiver
[ 9] 0.00-10.00 sec 205 MBytes 172 Mbits/sec 0 sender
[ 9] 0.00-10.02 sec 202 MBytes 169 Mbits/sec
receiver
[ 11] 0.00-10.00 sec 204 MBytes 171 Mbits/sec 0 sender
[ 11] 0.00-10.02 sec 201 MBytes 169 Mbits/sec
receiver
[ 13] 0.00-10.00 sec 204 MBytes 171 Mbits/sec 0 sender
[ 13] 0.00-10.02 sec 200 MBytes 168 Mbits/sec
receiver
[SUM] 0.00-10.00 sec 1019 MBytes 855 Mbits/sec 0 sender
[SUM] 0.00-10.02 sec 1006 MBytes 842 Mbits/sec
receiver
iperf3 -c bouygues.iperf.fr -d -P 5 -R
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.02 sec 281 MBytes 235 Mbits/sec 128 sender
[ 5] 0.00-10.00 sec 277 MBytes 232 Mbits/sec
receiver
[ 7] 0.00-10.02 sec 267 MBytes 223 Mbits/sec 154 sender
[ 7] 0.00-10.00 sec 263 MBytes 221 Mbits/sec
receiver
[ 9] 0.00-10.02 sec 170 MBytes 142 Mbits/sec 154 sender
[ 9] 0.00-10.00 sec 166 MBytes 139 Mbits/sec
receiver
[ 11] 0.00-10.02 sec 161 MBytes 135 Mbits/sec 211 sender
[ 11] 0.00-10.00 sec 158 MBytes 132 Mbits/sec
receiver
[ 13] 0.00-10.02 sec 219 MBytes 183 Mbits/sec 116 sender
[ 13] 0.00-10.00 sec 216 MBytes 181 Mbits/sec
receiver
[SUM] 0.00-10.02 sec 1.07 GBytes 919 Mbits/sec 763 sender
[SUM] 0.00-10.00 sec 1.05 GBytes 906 Mbits/sec
receiver
3.8.4-NAPI w/o TSO & GSO (Without buffer overrun patch)
iperf3 -c bouygues.iperf.fr -d -P 5
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 220 MBytes 184 Mbits/sec 0 sender
[ 5] 0.00-10.02 sec 218 MBytes 182 Mbits/sec
receiver
[ 7] 0.00-10.00 sec 220 MBytes 185 Mbits/sec 0 sender
[ 7] 0.00-10.02 sec 217 MBytes 182 Mbits/sec
receiver
[ 9] 0.00-10.00 sec 216 MBytes 182 Mbits/sec 0 sender
[ 9] 0.00-10.02 sec 213 MBytes 179 Mbits/sec
receiver
[ 11] 0.00-10.00 sec 220 MBytes 185 Mbits/sec 0 sender
[ 11] 0.00-10.02 sec 218 MBytes 182 Mbits/sec
receiver
[ 13] 0.00-10.00 sec 221 MBytes 185 Mbits/sec 0 sender
[ 13] 0.00-10.02 sec 218 MBytes 182 Mbits/sec
receiver
[SUM] 0.00-10.00 sec 1.07 GBytes 920 Mbits/sec 0 sender
[SUM] 0.00-10.02 sec 1.06 GBytes 907 Mbits/sec
receiver
iperf3 -c bouygues.iperf.fr -d -P 5 -R
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.02 sec 259 MBytes 217 Mbits/sec 67 sender
[ 5] 0.00-10.00 sec 255 MBytes 214 Mbits/sec
receiver
[ 7] 0.00-10.02 sec 256 MBytes 214 Mbits/sec 168 sender
[ 7] 0.00-10.00 sec 252 MBytes 212 Mbits/sec
receiver
[ 9] 0.00-10.02 sec 260 MBytes 217 Mbits/sec 189 sender
[ 9] 0.00-10.00 sec 256 MBytes 215 Mbits/sec
receiver
[ 11] 0.00-10.02 sec 165 MBytes 138 Mbits/sec 237 sender
[ 11] 0.00-10.00 sec 161 MBytes 135 Mbits/sec
receiver
[ 13] 0.00-10.02 sec 172 MBytes 144 Mbits/sec 220 sender
[ 13] 0.00-10.00 sec 169 MBytes 142 Mbits/sec
receiver
[SUM] 0.00-10.02 sec 1.08 GBytes 930 Mbits/sec 881 sender
[SUM] 0.00-10.00 sec 1.07 GBytes 917 Mbits/sec
receiver
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