CentOS 7.6にはAzure用にチューニングされたカーネルがあるのだけれど、デフォルトではインストールされていないので以下の手順が必要。
デフォルトでインストールされているカーネルを確認。
$ uname -r
3.10.0-862.11.6.el7.x86_64これはCentOS 7.5のカーネル。
kernel-azureパッケージをインストール。
$ sudo yum -y install centos-release-azure
$ sudo yum -y install kernel-azure
$ sudo reboot再起動後、カーネルを再度確認。
$ uname -r
3.10.0-957.21.3.el7.azure.x86_64いつもと同じようにiperf3でloでテスト。Azure用カーネル、劇的に性能上がる。
# uname -r
3.10.0-957.1.3.el7.x86_64
# iperf3 -c 127.0.0.1 -u -l 16 -b 20M
Connecting to host 127.0.0.1, port 5201
[ 4] local 127.0.0.1 port 49703 connected to 127.0.0.1 port 5201
[ ID] Interval Transfer Bandwidth Total Datagrams
[ 4] 0.00-1.00 sec 1.69 MBytes 14.2 Mbits/sec 110626
[ 4] 1.00-2.00 sec 1.64 MBytes 13.8 Mbits/sec 107513
[ 4] 2.00-3.00 sec 1.94 MBytes 16.2 Mbits/sec 126838
[ 4] 3.00-4.00 sec 1.57 MBytes 13.2 Mbits/sec 103206
[ 4] 4.00-5.00 sec 2.16 MBytes 18.1 Mbits/sec 141488
[ 4] 5.00-6.00 sec 1.80 MBytes 15.1 Mbits/sec 117800
[ 4] 6.00-7.00 sec 1.92 MBytes 16.1 Mbits/sec 125602
[ 4] 7.00-8.00 sec 1.73 MBytes 14.5 Mbits/sec 113292
[ 4] 8.00-9.00 sec 2.06 MBytes 17.3 Mbits/sec 135330
[ 4] 9.00-10.00 sec 2.00 MBytes 16.7 Mbits/sec 130795
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 4] 0.00-10.00 sec 18.5 MBytes 15.5 Mbits/sec 0.007 ms 352/1212490 (0.029%)
[ 4] Sent 1212490 datagrams
iperf Done.
# iperf3 -c 127.0.0.1 -u -l 16 -b 40M
Connecting to host 127.0.0.1, port 5201
[ 4] local 127.0.0.1 port 33688 connected to 127.0.0.1 port 5201
[ ID] Interval Transfer Bandwidth Total Datagrams
[ 4] 0.00-1.00 sec 1.48 MBytes 12.4 Mbits/sec 96935
[ 4] 1.00-2.00 sec 1.55 MBytes 13.0 Mbits/sec 101492
[ 4] 2.00-3.00 sec 1.62 MBytes 13.6 Mbits/sec 106127
[ 4] 3.00-4.00 sec 1.34 MBytes 11.2 Mbits/sec 87531
[ 4] 4.00-5.00 sec 1.88 MBytes 15.7 Mbits/sec 122992
[ 4] 5.00-6.00 sec 1.35 MBytes 11.3 Mbits/sec 88171
[ 4] 6.00-7.00 sec 1.60 MBytes 13.5 Mbits/sec 105106
[ 4] 7.00-8.00 sec 1.91 MBytes 16.1 Mbits/sec 125484
[ 4] 8.00-9.00 sec 1.72 MBytes 14.4 Mbits/sec 112536
[ 4] 9.00-10.00 sec 1.34 MBytes 11.3 Mbits/sec 88005
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 4] 0.00-10.00 sec 15.8 MBytes 13.2 Mbits/sec 0.007 ms 58/1034379 (0.0056%)
[ 4] Sent 1034379 datagrams
iperf Done.
# uname -r
3.10.0-957.21.3.el7.azure.x86_64
# iperf3 -c 127.0.0.1 -u -l 16 -b 20M
Connecting to host 127.0.0.1, port 5201
[ 4] local 127.0.0.1 port 58778 connected to 127.0.0.1 port 5201
[ ID] Interval Transfer Bandwidth Total Datagrams
[ 4] 0.00-1.00 sec 2.33 MBytes 19.5 Mbits/sec 152401
[ 4] 1.00-2.00 sec 2.39 MBytes 20.0 Mbits/sec 156379
[ 4] 2.00-3.00 sec 2.23 MBytes 18.7 Mbits/sec 146162
[ 4] 3.00-4.00 sec 2.46 MBytes 20.6 Mbits/sec 161235
[ 4] 4.00-5.00 sec 2.32 MBytes 19.4 Mbits/sec 151733
[ 4] 5.00-6.00 sec 2.53 MBytes 21.2 Mbits/sec 165982
[ 4] 6.00-7.00 sec 2.38 MBytes 20.0 Mbits/sec 156162
[ 4] 7.00-8.00 sec 2.43 MBytes 20.4 Mbits/sec 159078
[ 4] 8.00-9.00 sec 2.32 MBytes 19.5 Mbits/sec 152196
[ 4] 9.00-10.00 sec 2.44 MBytes 20.5 Mbits/sec 160227
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 4] 0.00-10.00 sec 23.8 MBytes 20.0 Mbits/sec 0.003 ms 0/1561555 (0%)
[ 4] Sent 1561555 datagrams
iperf Done.
# iperf3 -c 127.0.0.1 -u -l 16 -b 40M
Connecting to host 127.0.0.1, port 5201
[ 4] local 127.0.0.1 port 43757 connected to 127.0.0.1 port 5201
[ ID] Interval Transfer Bandwidth Total Datagrams
[ 4] 0.00-1.00 sec 3.55 MBytes 29.8 Mbits/sec 232619
[ 4] 1.00-2.00 sec 3.15 MBytes 26.5 Mbits/sec 206694
[ 4] 2.00-3.00 sec 2.91 MBytes 24.4 Mbits/sec 190630
[ 4] 3.00-4.00 sec 3.62 MBytes 30.4 Mbits/sec 237474
[ 4] 4.00-5.00 sec 3.60 MBytes 30.2 Mbits/sec 235865
[ 4] 5.00-6.00 sec 3.08 MBytes 25.8 Mbits/sec 201622
[ 4] 6.00-7.00 sec 2.96 MBytes 24.8 Mbits/sec 193999
[ 4] 7.00-8.00 sec 3.33 MBytes 27.9 Mbits/sec 218094
[ 4] 8.00-9.00 sec 3.54 MBytes 29.7 Mbits/sec 232162
[ 4] 9.00-10.00 sec 3.51 MBytes 29.4 Mbits/sec 229942
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 4] 0.00-10.00 sec 33.3 MBytes 27.9 Mbits/sec 0.004 ms 0/2179101 (0%)
[ 4] Sent 2179101 datagrams
iperf Done.