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authorLuca De Cicco <ldecicco@gmail.com>2006-06-11 23:01:59 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-06-17 21:30:36 -0700
commitb3a92eabe5b67bd207a38ae13dd51f4e08c1f6f7 (patch)
tree511472b1fb5e71e810dd73c9d8b11c12d9aa0efe /net/ipv4/tcp_westwood.c
parent[TCP] Westwood: comment fixes (diff)
downloadlinux-dev-b3a92eabe5b67bd207a38ae13dd51f4e08c1f6f7.tar.xz
linux-dev-b3a92eabe5b67bd207a38ae13dd51f4e08c1f6f7.zip
[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>
Diffstat (limited to 'net/ipv4/tcp_westwood.c')
-rw-r--r--net/ipv4/tcp_westwood.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/net/ipv4/tcp_westwood.c b/net/ipv4/tcp_westwood.c
index 12a2cd976e3a..edf2ee19a8ba 100644
--- a/net/ipv4/tcp_westwood.c
+++ b/net/ipv4/tcp_westwood.c
@@ -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);
+ }
}
/*