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[CCID2]: Larger initial windows also for CCID2

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RFC 4341, sec. 5 states that "The cwnd parameter is initialized to at most
four packets for new connections, following the rules from [RFC3390]", which
is implemented by this patch.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker 2007-11-24 21:44:30 -02:00 committed by David S. Miller
parent e18d7a9857
commit b00d2bbc45
1 changed files with 15 additions and 5 deletions
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20
net/dccp/ccids/ccid2.c
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@ -741,15 +741,25 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
{
struct ccid2_hc_tx_sock *hctx = ccid_priv(ccid);
struct dccp_sock *dp = dccp_sk(sk);
u32 max_ratio;
ccid2_change_cwnd(hctx, 1);
/* Initialize ssthresh to infinity. This means that we will exit the
* initial slow-start after the first packet loss. This is what we
* want.
*/
/* RFC 4341, 5: initialise ssthresh to arbitrarily high (max) value */
hctx->ccid2hctx_ssthresh = ~0;
hctx->ccid2hctx_numdupack = 3;
/*
* RFC 4341, 5: "The cwnd parameter is initialized to at most four
* packets for new connections, following the rules from [RFC3390]".
* We need to convert the bytes of RFC3390 into the packets of RFC 4341.
*/
hctx->ccid2hctx_cwnd = min(4U, max(2U, 4380U / dp->dccps_mss_cache));
/* Make sure that Ack Ratio is enabled and within bounds. */
max_ratio = DIV_ROUND_UP(hctx->ccid2hctx_cwnd, 2);
if (dp->dccps_l_ack_ratio == 0 || dp->dccps_l_ack_ratio > max_ratio)
dp->dccps_l_ack_ratio = max_ratio;
/* XXX init ~ to window size... */
if (ccid2_hc_tx_alloc_seq(hctx))
return -ENOMEM;