> was there any response to the issue brought up on the list a while ago
> about 2.2.* using 2x the specified value for the SND/RCV buffer?
>
> the offending code is [linux/net/core/sock.c]:
> case SO_SNDBUF:
> if (val > sysctl_wmem_max)
> val = sysctl_wmem_max;
> sk->sndbuf = max(val*2,2048);
>
> this seems pretty retarted to me, is there any reason to give the user twice the
> value they asked for?
Linux counts internal headers in the buffer. BSD does not. This is a heuristic
for compatibility (half of the buffer reserved for headers). To compensate the
TCP window offering is halved.
-Andi
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