In testing performed internally at Microsoft, large file backup times were reduced by almost half for a 1 Gbps connection with a 50ms RTT. Connections with a larger bandwidth delay product can have even better performance. CTCP and Receive Window Auto-Tuning work together for increased link utilization and can result in substantial performance gains for large bandwidth-delay product connections.
CTCP is enabled by default in computers running beta versions of Windows Server 2008 and disabled by default in computers running Windows Vista. You can enable CTCP with the netsh interface tcp set global congestionprovider=ctcp command. You can disable CTCP with the netsh interface tcp set global congestionprovider=none command.
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