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[DCCP] ACKVEC: Optimization - Do not traverse records if none will be found

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Do not traverse the list of ack vector records [proportional to window size]
when we know we will not find what we are looking for.  This is especially
useful because ack vectors are checked twice:
1) Upon parsing of options.
2) Upon notification of a new ack.

All of the work will occur during check #1.  Therefore, when check #2 is
performed, no new work will be done.  This is now "detected" and there is no
performance hit when doing #2.

Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
This commit is contained in:
Andrea Bittau 2006-11-14 13:19:45 -02:00 committed by David S. Miller
parent 09dbc3895e
commit d23ca15a21
1 changed files with 2 additions and 1 deletions
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3
net/dccp/ackvec.c
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@ -383,7 +383,8 @@ void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av, struct sock *sk,
(unsigned long long)avr->dccpavr_ack_ackno);
dccp_ackvec_throw_record(av, avr);
break;
}
} else if (avr->dccpavr_ack_seqno > ackno)
break; /* old news */
}
}