Changes between Version 133 and Version 134 of doc/FireFoxTorPerf


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Timestamp:
Apr 23, 2010, 10:48:33 AM (11 years ago)
Author:
trac
Comment:

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  • doc/FireFoxTorPerf

    v133 v134  
    4343
    4444== TCP/IP - Optimise 2K/XP's throughput (win32) ==
    45 Windows XP has a self-tuning IP stack, but it can still benefit from a little help. Using the TCP Optimiser tool from above you can tune the RWIN, SACK OPTS (rfc 2038), and tcp1323opts controlling window scaling. The tool has one button optimise. This setting is sufficient to benefit from immediate increases to Tor throughput. To increase throughput further you can try experimenting with lower values of the IP TTL (Time To Live). Values as low as 32 will work and result in improved performance. Also try experimenting with smaller TCPWindowSizes. This setting is automatically adjusted when you move the slider marked 'Connection Speed' of the TCPOptimizer  tool. Maximum throughput occurs when TCPReceiveWindow sizes < 65536 are applied. Currently theory is that above this size, TCP Receive Window Scaling comes into effect on Windows 2K/XP. The current theory is that TOR does not negotiate Scaling Receive Windows very well, which causes the IP stream to stall, reducing overall throughput.
     45Windows XP has a self-tuning IP stack, but it can still benefit from a little help. Using the TCP Optimiser tool from above you can tune the RWIN, SACK OPTS (rfc 2038), and tcp1323opts controlling window scaling. The tool has one button optimise. This setting is sufficient to benefit from immediate increases to Tor throughput. To increase throughput further you can try experimenting with lower values of the IP TTL (Time To Live). Values as low as 32 will work and result in improved performance. Also try experimenting with smaller TCPWindowSizes. This setting is automatically adjusted when you move the slider marked 'Connection Speed' of the TCPOptimizer  tool.
    4646
    4747== Remove the limit on TCP connection attempts XP SP2 (win32) ==