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Improve comments by listing a criteria for automatic increment of receive socket

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buffer.

Reviewed by:	jmg
This commit is contained in:
Hiren Panchasara 2014-08-09 21:01:24 +00:00
parent 1a4574596c
commit f7469d3e52
1 changed files with 5 additions and 3 deletions
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8
sys/netinet/tcp_input.c
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@ -1793,11 +1793,13 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
* 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.