On Thu, Apr 26, 2018 at 12:58 PM Wei Wang <[email protected]> wrote: > From: Wei Wang <[email protected]>
> In tcp_select_initial_window(), we only set rcv_wnd to > tcp_default_init_rwnd() if current mss > (1 << wscale). Otherwise, > rcv_wnd is kept at the full receive space of the socket which is a > value way larger than tcp_default_init_rwnd(). > With larger initial rcv_wnd value, receive buffer autotuning logic > takes longer to kick in and increase the receive buffer. > In a TCP throughput test where receiver has rmem[2] set to 125MB > (wscale is 11), we see the connection gets recvbuf limited at the > beginning of the connection and gets less throughput overall. > Signed-off-by: Wei Wang <[email protected]> > Acked-by: Eric Dumazet <[email protected]> > Acked-by: Soheil Hassas Yeganeh <[email protected]> > Acked-by: Yuchung Cheng <[email protected]> > --- Acked-by: Neal Cardwell <[email protected]> Thanks, Wei! neal
