Differences

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--- vms:bittorrent [2017/06/01 17:41]
admin [Transmission]
+++ vms:bittorrent [2017/06/02 04:36] (current)
admin [Transmission]
@@ Line 61: / Line 61: @@
 MemoryHigh=35M
 ProtectSystem=true
+> systemctl daemon-reload
 </Code>
+Note that we reload daemons for our changes to take effect.
+=== UDP socket buffers ===
+Setting ''"message-level": 3,'' in ''/var/lib/transmission-daemon/info/settings.json'', then monitoring ''/var/log/syslog'', or better ''/var/log/daemon.log'' will show:
+<Code>
+Jun  2 04:18:24 transmission-20 transmission-daemon[4243]: [2017-06-02 04:18:24.532 CEST] UDP Failed to set receive buffer: requested 4194304, got 425984 (tr-udp.c:78)
+Jun  2 04:18:24 transmission-20 transmission-daemon[4243]: [2017-06-02 04:18:24.534 CEST] UDP Failed to set send buffer: requested 1048576, got 425984 (tr-udp.c:89)
+</Code>
+It seems Transmission is willing to get a 4MB receive buffer and a 1MB send buffer, while only 256K are available. We'll fix that using the following commands:
+<Code>
+> echo 'net.core.rmem_max = 16777216' >> /etc/sysctl.conf
+> echo 'net.core.wmem_max = 4194304' >> /etc/sysctl.conf
+> sysctl -p
+</Code>
+For production servers with hundreds of connections 16MB receive and 4MB send buffers are recommended [[https://trac.transmissionbt.com/ticket/4321| read more here...]]
 ===== mitorrent =====
 [[https://github.com/da2x/mitorrent]]