On Thursday, March 9, 2017, Shiyao Ma <[email protected]> wrote: > Hi, > > The related settings are, > > sudo sysctl -w net.core.rmem_max=2147483647 > sudo sysctl -w net.core.wmem_max=2147483647 > > sudo sysctl -w net.ipv4.tcp_rmem="10240 8738000 2147483647" > sudo sysctl -w net.ipv4.tcp_wmem="10240 8738000 2147483647" > > sudo sysctl -w net.ipv4.tcp_limit_output_bytes=2147483647 > > They are insanely big. > > How big are the data you send during single call of send() ?
Also, what parameters do you use in send () ? > However, when executing `send' for a large buffer, it still blocks. > > I thought L4 (tcp) will accept that large buffer as long as it can copy > those buffer into kernel. > Turns out not. > > What could be the possible reason? > Does the TCP check the `cwnd' setting or so even in the step of copying > buffer from userspace to kernel? I didn't find the related code, though. > > > Regards. > > > -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com
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