socket: setting SO_SNDBUF

From: Reto Baettig (baettig@scs.ch)
Date: Mon May 08 2000 - 19:57:43 EST

hi,

I do not understand why setting SO_SNDBUF with

        res = BUFSIZE;
        err = setsockopt(s, SOL_SOCKET, SO_SNDBUF, &res, len);

actually sets the buffer size to 2*BUFSIZE. What is the reason for that?

The corresponding code fragment is in sock.c, int sock_setsockopt(...

213
214 if (val > sysctl_wmem_max)
215 val = sysctl_wmem_max;
216
217 !!!!! sk->sndbuf = max(val*2,2048);
218
219 /*
220 * Wake up sending tasks if we
221 * upped the value.
222 */
223 sk->write_space(sk);
224 break;

... same for SO_RECVBUF

thank you

reto

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