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--- nfs.c.orig Tue Mar 12 21:44:19 2002
+++ nfs.c Thu Mar 14 07:51:43 2002
@@ -321,6 +321,14 @@
int retries;
long *p;
+ static int tokens=0;
+ /*
+ * Try to implement something similar to a window protocol in
+ * terms of response to losses. On successful receive, increment
+ * the number of tokens by 1 (cap at 256). On failure, halve it.
+ * When the number of tokens is >= 2, use a very short timeout.
+ */
+
id = rpc_id++;
buf.u.call.id = htonl(id);
buf.u.call.type = htonl(MSG_CALL);
@@ -336,9 +344,14 @@
*p++ = 0; /* unused parameter */
for (retries = 0; retries < MAX_RPC_RETRIES; retries++) {
long timeout = rfc2131_sleep_interval(TIMEOUT, retries);
+ if (tokens >= 2)
+ timeout = TICKS_PER_SEC/2;
+
udp_transmit(arptable[server].ipaddr.s_addr, sport, port,
(char *)p - (char *)&buf, &buf);
if (await_reply(AWAIT_RPC, sport, &id, timeout)) {
+ if (tokens < 256)
+ tokens++;
rpc = (struct rpc_t *)&nic.packet[ETH_HLEN];
if (rpc->u.reply.rstatus || rpc->u.reply.verifier ||
rpc->u.reply.astatus || rpc->u.reply.data[0]) {
@@ -355,7 +368,8 @@
} else {
return 0;
}
- }
+ } else
+ tokens >>= 1;
}
return -1;
}
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