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Correct a bug in TCP SACK that could result in wedging of the TCP stack

Browse source 
under high load: only set function state to loop and continuing sending
if there is no data left to send.

RELENG_5_3 candidate.

Feet provided:	Peter Losher <Peter underscore Losher at isc dot org>
Diagnosed by:	Aniel Hartmeier <daniel at benzedrine dot cx>
Submitted by:	mohan <mohans at yahoo-inc dot com>
This commit is contained in:
Robert Watson 2004-10-30 12:02:50 +00:00
parent 0b762445b9
commit ab5c14d828
1 changed files with 2 additions and 2 deletions
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4
sys/netinet/tcp_output.c
View file

@ -231,12 +231,12 @@ again:
tp->snd_recover - p->rxmit));
} else
len = ((long)ulmin(cwin, p->end - p->rxmit));
sack_rxmit = 1;
sendalot = 1;
off = p->rxmit - tp->snd_una;
KASSERT(off >= 0,("%s: sack block to the left of una : %d",
__func__, off));
if (len > 0) {
sack_rxmit = 1;
sendalot = 1;
tcpstat.tcps_sack_rexmits++;
tcpstat.tcps_sack_rexmit_bytes +=
min(len, tp->t_maxseg);