| #!/bin/sh |
| case "$1" in |
| start) |
| # Decrease tcp keep alive time, probing intervals and number of probes |
| # because of the high instability of our customers' networks. |
| # The default values are: |
| # net.ipv4.tcp_keepalive_time = 7200 |
| # net.ipv4.tcp_keepalive_intvl = 75 |
| # net.ipv4.tcp_keepalive_probes = 9 |
| sysctl net.ipv4.tcp_keepalive_time=600 #10min |
| # Interval between probes. |
| sysctl net.ipv4.tcp_keepalive_intvl=30 #30s |
| # Number of consecutive probing failures before dropping the connection. |
| sysctl net.ipv4.tcp_keepalive_probes=3 |
| # TODO(erdi): Disable IPv6 until it is fully supported in App. |
| sysctl net.ipv6.conf.all.disable_ipv6=1 |
| # SpaceCast receives packets from a 60Mbps multicast UDP stream. |
| # Avoid UDP packet loss by increasing socket buffer size. |
| # rmem_default defines the default receive socket buffer size in bytes. |
| sysctl net.core.rmem_default=16777216 #16MB |
| # rmem_max defines the maximum receive socket buffer size in bytes. |
| sysctl net.core.rmem_max=33554432 #32MB |
| # Set the socket write buffer size large enough to hold a complete |
| # blocksize from the streamer. |
| # wmem_max defines the maximum send socket buffer size in bytes. |
| sysctl net.core.wmem_max=1572864 |
| # Run the kernel flusher threads every 500ms (instead of every 5s) |
| # On systems without a full cache most data from the 60Mbps stream is |
| # written to disk. At 500ms the data can be written out relatively |
| # early, without hogging the CPU. |
| sysctl vm.dirty_writeback_centisecs=50 |
| # Make dirty pages eligible for writeout by the flusher threads after |
| # 100ms (instead of 30s). On SpaceCast there is no benefit in delaying |
| # the writeout and accumulating dirty pages which could be used by |
| # other parts of the system. |
| sysctl vm.dirty_expire_centisecs=10 |
| # Panic everytime there is a kernel oops |
| sysctl -q kernel.panic_on_oops=1 |
| ;; |
| stop) |
| ;; |
| restart|reload) |
| $0 stop; $0 start ;; |
| *) |
| echo "Usage: $0 {start|stop|restart}" |
| exit 1 |
| esac |
