Author: hiren
Date: Sat Aug 9 21:01:24 2014
New Revision: 269766
URL: http://svnweb.freebsd.org/changeset/base/269766
Log:
Improve comments by listing a criteria for automatic increment of receive
socket
buffer.
Reviewed by: jmg
Modified:
head/sys/netinet/tcp_input.c
Modified: head/sys/netinet/tcp_input.c
==============================================================================
--- head/sys/netinet/tcp_input.c Sat Aug 9 20:40:03 2014
(r269765)
+++ head/sys/netinet/tcp_input.c Sat Aug 9 21:01:24 2014
(r269766)
@@ -1793,11 +1793,13 @@ tcp_do_segment(struct mbuf *m, struct tc
* reassembly queue.
*
* The criteria to step up the receive buffer one notch are:
- * 1. the number of bytes received during the time it takes
+ * 1. Application has not set receive buffer size with
+ * SO_RCVBUF. Setting SO_RCVBUF clears SB_AUTOSIZE.
+ * 2. the number of bytes received during the time it takes
* one timestamp to be reflected back to us (the RTT);
- * 2. received bytes per RTT is within seven eighth of the
+ * 3. received bytes per RTT is within seven eighth of the
* current socket buffer size;
- * 3. receive buffer size has not hit maximal automatic size;
+ * 4. receive buffer size has not hit maximal automatic size;
*
* This algorithm does one step per RTT at most and only if
* we receive a bulk stream w/o packet losses or reorderings.
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