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[TCP] Westwood: bandwidth filter startup 

The bandwidth estimate filter is now initialized with the first
sample in order to have better performances in the case of small
file transfers.

Signed-off-by: Luca De Cicco <ldecicco@gmail.com>
Signed-off-by: Stephen Hemminger <shemminger@dxpl.pdx.osdl.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Luca De Cicco 2006-06-11 23:01:59 -07:00 committed by David S. Miller
parent b7d7a9e3c9
commit b3a92eabe5
1 changed files with 9 additions and 3 deletions
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12
net/ipv4/tcp_westwood.c
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@ -82,10 +82,16 @@ static inline u32 westwood_do_filter(u32 a, u32 b)
return (((7 * a) + b) >> 3);
}
static inline void westwood_filter(struct westwood *w, u32 delta)
static void westwood_filter(struct westwood *w, u32 delta)
{
w->bw_ns_est = westwood_do_filter(w->bw_ns_est, w->bk / delta);
w->bw_est = westwood_do_filter(w->bw_est, w->bw_ns_est);
/* If the filter is empty fill it with the first sample of bandwidth */
if (w->bw_ns_est == 0 && w->bw_est == 0) {
w->bw_ns_est = w->bk / delta;
w->bw_est = w->bw_ns_est;
} else {
w->bw_ns_est = westwood_do_filter(w->bw_ns_est, w->bk / delta);
w->bw_est = westwood_do_filter(w->bw_est, w->bw_ns_est);
}
}
/*