Steven Hartland e44c1887fd Use estimated RTT for receive buffer auto resizing instead of timestamps ... Switched from using timestamps to RTT estimates when performing TCP receive buffer auto resizing, as not all hosts support / enable TCP timestamps. Disabled reset of receive buffer auto scaling when not in bulk receive mode, which gives an extra 20% performance increase. Also extracted auto resizing to a common method shared between standard and fastpath modules. With this AWS S3 downloads at ~17ms latency on a 1Gbps connection jump from ~3MB/s to ~100MB/s using the default settings. Reviewed by: lstewart, gnn MFC after: 2 weeks Relnotes: Yes Sponsored by: Multiplay Differential Revision: https://reviews.freebsd.org/D9668		2017-04-10 08:19:35 +00:00
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fastpath.c	Use estimated RTT for receive buffer auto resizing instead of timestamps	2017-04-10 08:19:35 +00:00