diff options
| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2007-03-20 18:28:44 +0100 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-26 07:26:49 +0200 |
| commit | 371fe7779cad6557a58df9a1b5543652e067400f (patch) | |
| tree | 037be0b166906ff91f2b4a7c7d11a01180a0db61 | |
| parent | [CCID3]: Re-order CCID 3 source file (diff) | |
| download | linux-371fe7779cad6557a58df9a1b5543652e067400f.tar.xz linux-371fe7779cad6557a58df9a1b5543652e067400f.zip | |
[CCID3]: Use MSS for larger initial windows
This improves the slow-start phase by using the MSS
(as suggested in RFC 4342, sec. 5) instead of the packet size s.
Also figured out that __u32 is ample resource enough.
After applying, I got the following in the logs:
ccid3_hc_tx_packet_recv: client(f7421700), s=6, MSS=1424, w_init=4380, R_sample=176us, X=24886363
Had the previous variant been used, w_init would have been as low as 24.
Committer note: removed unneeded cast to unsigned long long that was
causing a compiler warning on 64bit architectures.
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>
| -rw-r--r-- | net/dccp/ccids/ccid3.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c index 0009b399d146..52dae40bdffb 100644 --- a/net/dccp/ccids/ccid3.c +++ b/net/dccp/ccids/ccid3.c @@ -466,20 +466,20 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { /* * Larger Initial Windows [RFC 4342, sec. 5] - * We deviate in that we use `s' instead of `MSS'. */ - __u64 w_init = min(4 * hctx->ccid3hctx_s, - max(2 * hctx->ccid3hctx_s, 4380)); + __u32 w_init = min(4 * dp->dccps_mss_cache, + max(2 * dp->dccps_mss_cache, 4380U)); hctx->ccid3hctx_rtt = r_sample; hctx->ccid3hctx_x = scaled_div(w_init << 6, r_sample); hctx->ccid3hctx_t_ld = now; ccid3_update_send_time(hctx); - ccid3_pr_debug("%s(%p), s=%u, w_init=%llu, " + ccid3_pr_debug("%s(%p), s=%u, MSS=%u, w_init=%u, " "R_sample=%dus, X=%u\n", dccp_role(sk), sk, hctx->ccid3hctx_s, - (unsigned long long)w_init, + dp->dccps_mss_cache, + w_init, (int)r_sample, (unsigned)(hctx->ccid3hctx_x >> 6)); |