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9227fe1c3d
terms of response to losses. This makes etherboot work much smoother when nfs-loading kernels in presence of a small amount of losses. A similar patch will be committed shortly for tftp loads (in the process of testing that, Doug Ambrisko and I found a bug in FreeBSD's tftpd!). These patches are being submitted to the etheboot developers for integration in future releases of etherboot.
42 lines
1.2 KiB
Text
42 lines
1.2 KiB
Text
--- nfs.c.orig Tue Mar 12 21:44:19 2002
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+++ nfs.c Thu Mar 14 07:51:43 2002
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@@ -321,6 +321,14 @@
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int retries;
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long *p;
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+ static int tokens=0;
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+ /*
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+ * Try to implement something similar to a window protocol in
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+ * terms of response to losses. On successful receive, increment
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+ * the number of tokens by 1 (cap at 256). On failure, halve it.
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+ * When the number of tokens is >= 2, use a very short timeout.
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+ */
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+
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id = rpc_id++;
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buf.u.call.id = htonl(id);
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buf.u.call.type = htonl(MSG_CALL);
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@@ -336,9 +344,14 @@
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*p++ = 0; /* unused parameter */
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for (retries = 0; retries < MAX_RPC_RETRIES; retries++) {
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long timeout = rfc2131_sleep_interval(TIMEOUT, retries);
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+ if (tokens >= 2)
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+ timeout = TICKS_PER_SEC/2;
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+
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udp_transmit(arptable[server].ipaddr.s_addr, sport, port,
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(char *)p - (char *)&buf, &buf);
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if (await_reply(AWAIT_RPC, sport, &id, timeout)) {
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+ if (tokens < 256)
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+ tokens++;
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rpc = (struct rpc_t *)&nic.packet[ETH_HLEN];
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if (rpc->u.reply.rstatus || rpc->u.reply.verifier ||
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rpc->u.reply.astatus || rpc->u.reply.data[0]) {
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@@ -355,7 +368,8 @@
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} else {
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return 0;
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}
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- }
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+ } else
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+ tokens >>= 1;
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}
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return -1;
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}
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