今回はCentOS7.3のネットワーク周りのチューニングを実施し、お金を掛けないでスループットを上げましょう。
性能測定ツールの導入
まずは性能測定ツールですが、speedtest.netはWindowsでもよく利用させてもらっていますが、Linuxコマンドライン用のspeedtest.netもあるんです。まずはこれをインストールします。
# yum install python-setuptools
# easy_install speedtest-cli
# easy_install speedtest-cli
でインストールできます。
使い方は、単純にspeedtest-cliと打つだけでいいのですが、
# speedtest-cli
Retrieving speedtest.net configuration…
Testing from Asahi Net (218.45.184.224)…
Retrieving speedtest.net server list…
Selecting best server based on ping…
Hosted by Cordeos Corp. (Tokyo) [3.50 km]: 12.162 ms
Testing download speed……………………………………………………………………..
Download: 281.61 Mbit/s
Testing upload speed……………………………………………………………………………………….
Upload: 136.43 Mbit/s
#
Retrieving speedtest.net configuration…
Testing from Asahi Net (218.45.184.224)…
Retrieving speedtest.net server list…
Selecting best server based on ping…
Hosted by Cordeos Corp. (Tokyo) [3.50 km]: 12.162 ms
Testing download speed……………………………………………………………………..
Download: 281.61 Mbit/s
Testing upload speed……………………………………………………………………………………….
Upload: 136.43 Mbit/s
#
以外と速い…（笑）。
サーバーを指定することもできます。
# speedtest-cli –list | grep -i tokyo
6424) Cordeos Corp. (Tokyo, Japan) [3.50 km]
7510) ASEINet (Tokyo, Japan) [3.50 km]
#
# speedtest-cli –server 6424
Retrieving speedtest.net configuration…
Testing from Asahi Net (218.45.184.224)…
Retrieving speedtest.net server list…
Selecting best server based on ping…
Hosted by Cordeos Corp. (Tokyo) [3.50 km]: 14.251 ms
Testing download speed……………………………………………………………………..
Download: 196.98 Mbit/s
Testing upload speed……………………………………………………………………………………….
Upload: 143.64 Mbit/s
#
6424) Cordeos Corp. (Tokyo, Japan) [3.50 km]
7510) ASEINet (Tokyo, Japan) [3.50 km]
#
# speedtest-cli –server 6424
Retrieving speedtest.net configuration…
Testing from Asahi Net (218.45.184.224)…
Retrieving speedtest.net server list…
Selecting best server based on ping…
Hosted by Cordeos Corp. (Tokyo) [3.50 km]: 14.251 ms
Testing download speed……………………………………………………………………..
Download: 196.98 Mbit/s
Testing upload speed……………………………………………………………………………………….
Upload: 143.64 Mbit/s
#
もちろん–server 7510でも構いません。
tunedを使ったチューニング
ネットワーク周りのチューニングにはカーネルパラメーターを調整してチューニングするのもいいのですが、tuned（チューニングデーモン）を使ってチューニングしていきます。
tunedではプロファイルを指定することで手軽にチューニングが行えます。
まずはプロファイルの確認ですが、
# tuned-adm list
Available profiles:
– balanced – General non-specialized tuned profile
– desktop – Optmize for the desktop use-case
– latency-performance – Optimize for deterministic performance at the cost of increased power consumption
– network-latency – Optimize for deterministic performance at the cost of increased power consumption, focused on low latency network performance
– network-throughput – Optimize for streaming network throughput. Generally only necessary on older CPUs or 40G+ networks.
– powersave – Optimize for low power consumption
– throughput-performance – Broadly applicable tuning that provides excellent performance across a variety of common server workloads. This is the default profile for RHEL7.
– virtual-guest – Optimize for running inside a virtual guest.
– virtual-host – Optimize for running KVM guests
Current active profile: virtual-guest
Available profiles:
– balanced – General non-specialized tuned profile
– desktop – Optmize for the desktop use-case
– latency-performance – Optimize for deterministic performance at the cost of increased power consumption
– network-latency – Optimize for deterministic performance at the cost of increased power consumption, focused on low latency network performance
– network-throughput – Optimize for streaming network throughput. Generally only necessary on older CPUs or 40G+ networks.
– powersave – Optimize for low power consumption
– throughput-performance – Broadly applicable tuning that provides excellent performance across a variety of common server workloads. This is the default profile for RHEL7.
– virtual-guest – Optimize for running inside a virtual guest.
– virtual-host – Optimize for running KVM guests
Current active profile: virtual-guest
現在はvirtual-guestプロファイルが選択されていることが分かります。throughput-performanceプロファイルにしてみましょう。
# tuned-adm profile throughput-performance
speedtest-cliでスループットを測定してみます。
# speedtest-cli –server 6424
Retrieving speedtest.net configuration…
Testing from Asahi Net (218.45.184.224)…
Retrieving speedtest.net server list…
Selecting best server based on ping…
Hosted by Cordeos Corp. (Tokyo) [3.50 km]: 12.073 ms
Testing download speed……………………………………………………………………..
Download: 295.40 Mbit/s
Testing upload speed……………………………………………………………………………………….
Upload: 117.24 Mbit/s
#
Retrieving speedtest.net configuration…
Testing from Asahi Net (218.45.184.224)…
Retrieving speedtest.net server list…
Selecting best server based on ping…
Hosted by Cordeos Corp. (Tokyo) [3.50 km]: 12.073 ms
Testing download speed……………………………………………………………………..
Download: 295.40 Mbit/s
Testing upload speed……………………………………………………………………………………….
Upload: 117.24 Mbit/s
#
いきなり100Mbps弱もスループットが向上して驚きです。
これで一度様子を見てみることにします。
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