Created
March 23, 2017 17:57
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Safe sysctl tuning for modern high traffic systems
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| # Enable Packetization Layer Path MTU Discovery. | |
| net.ipv4.tcp_mtu_probing = 1 | |
| net.ipv4.tcp_base_mss = 1024 | |
| # Ensure slow start is disabled | |
| # https://github.com/ton31337/tools/wiki/tcp_slow_start_after_idle---tcp_no_metrics_save-performance | |
| net.ipv4.tcp_slow_start_after_idle = 0 | |
| net.ipv4.tcp_no_metrics_save = 0 | |
| # Tune network buffers - servers have more than 16MB of RAM in 2017 | |
| net.core.rmem_max = 16777216 | |
| net.core.wmem_max = 16777216 | |
| net.ipv4.tcp_rmem = 4096 87380 16777216 | |
| net.ipv4.tcp_wmem = 4096 65536 16777216 |
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Those rmem and wmem values cause bufferbloat.
Also consider changing to fq_codel; https://lwn.net/Articles/616241/
Here's my sysctl.conf; https://gist.github.com/jult/19decfc31ffae0b2b3fa4d48e2ffdd9f