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MFC 198499

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Improve the round robin stream scheduler.
This commit is contained in:
Michael Tuexen 2010-01-17 17:10:17 +00:00
parent 33dabcc064
commit fb7bf5f374
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/stable/8/; revision=202492
1 changed files with 5 additions and 11 deletions
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16
sys/netinet/sctp_output.c
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@ -7190,22 +7190,16 @@ sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
/* Find the next stream to use */
if (asoc->last_out_stream == NULL) {
strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
if (asoc->last_out_stream == NULL) {
/* huh nothing on the wheel, TSNH */
return (NULL);
strq = TAILQ_FIRST(&asoc->out_wheel);
} else {
strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
if (strq == NULL) {
strq = TAILQ_FIRST(&asoc->out_wheel);
}
goto done_it;
}
strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
done_it:
if (strq == NULL) {
strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
}
/* Save off the last stream */
asoc->last_out_stream = strq;
return (strq);
}