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webfs: keep up to 4 connections per peer in pool

--- a/sys/src/cmd/webfs/http.c

+++ b/sys/src/cmd/webfs/http.c

@@ -37,6 +37,7 @@

 	int	active;

 	int	limit;

+	int	peer;

 	int	idle;

 };

@@ -49,6 +50,7 @@

 static Hpool hpool = {

 	.limit	= 16,

+	.peer	= 4,

 	.idle	= 5,	/* seconds */

 };

@@ -128,7 +130,7 @@

 hclose(Hconn *h)

 {

 	Hconn *x, *t;

-	int i;

+	int i, n;

 	if(h == nil)

 		return;

@@ -135,9 +137,10 @@

 	qlock(&hpool);

 	if(h->keep && h->fd >= 0){

-		for(i = 0, t = nil, x = hpool.head; x; x = x->next){

+		for(n = 0, i = 0, t = nil, x = hpool.head; x; x = x->next){

 			if(strcmp(x->addr, h->addr) == 0)

-				break;

+				if(++n > hpool.peer)

+					break;

 			if(++i < hpool.limit)

 				t = x;

 		}