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Subjectrcv_wnd = init_cwnd*mss
Date
From

What is the reason for checking mss with 1<<rcv_wscale?
include/net/tcp.h:
static inline void tcp_select_initial_window(int __space, __u32 mss,
__u32 *rcv_wnd,
__u32 *window_clamp,
int wscale_ok,
__u8 *rcv_wscale)
{
.....
/* Set initial window to value enough for senders,
* following RFC1414. Senders, not following this RFC,
* will be satisfied with 2.
*/
if (mss > (1<<*rcv_wscale)) {
int init_cwnd = 4;
if (mss > 1460*3)
init_cwnd = 2;
else if (mss > 1460)
init_cwnd = 3;
if (*rcv_wnd > init_cwnd*mss)
*rcv_wnd = init_cwnd*mss;
}
......
}
---------
Perhaps the motivation was checking for
if (mss > rcv_wnd * (1<<*rcv_wscale)) {


Thanks,
Prasanna.
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