Can reconfigure on the fly, as shown below; note the poor TCP
performance with the default window. I suppose this qualifies
as timer abuse (one add_timer() per packet).
Cheers,
Peter Monta pmonta@imedia.com
Imedia Corp.
------------------------------
ncp1:/# ping 206.3.97.123
PING 206.3.97.123 (206.3.97.123): 56 data bytes
64 bytes from 206.3.97.123: icmp_seq=0 ttl=254 time=0.4 ms
64 bytes from 206.3.97.123: icmp_seq=1 ttl=254 time=0.4 ms
64 bytes from 206.3.97.123: icmp_seq=2 ttl=254 time=0.4 ms
64 bytes from 206.3.97.123: icmp_seq=3 ttl=254 time=0.4 ms
64 bytes from 206.3.97.123: icmp_seq=4 ttl=254 time=0.4 ms
--- 206.3.97.123 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 0.4/0.4/0.4 ms
ncp1:/# defer_config eth0 45
setting eth0 defer 45
ncp1:/# ping 206.3.97.123
PING 206.3.97.123 (206.3.97.123): 56 data bytes
64 bytes from 206.3.97.123: icmp_seq=0 ttl=254 time=445.0 ms
64 bytes from 206.3.97.123: icmp_seq=1 ttl=254 time=449.8 ms
64 bytes from 206.3.97.123: icmp_seq=2 ttl=254 time=449.8 ms
64 bytes from 206.3.97.123: icmp_seq=3 ttl=254 time=449.8 ms
64 bytes from 206.3.97.123: icmp_seq=4 ttl=254 time=449.8 ms
--- 206.3.97.123 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 445.0/448.8/449.8 ms
ncp1:/# ftp 206.3.97.123
Connected to 206.3.97.123.
220 halibut.imedia.com FTP server (Version wu-2.4.2-academ[BETA-18](1) Mon Aug 3 19:17:20 EDT 1998) ready.
Name (206.3.97.123:root): pmonta
331 Password required for pmonta.
Password:
230 User pmonta logged in.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> put vmlinuz xxx
local: vmlinuz remote: xxx
200 PORT command successful.
150 Opening BINARY mode data connection for xxx.
226 Transfer complete.
371513 bytes sent in 6.85 secs (53 Kbytes/sec)
ftp> quit
221 Goodbye.
ncp1:/#
------------------------------
patch to tulip.c:
--- /usr/src/linux-2.0.36/drivers/net/tulip.c Tue Oct 13 19:15:43 1998
+++ ./tulip.c Wed Feb 17 13:17:34 1999
@@ -17,6 +17,8 @@
http://cesdis.gsfc.nasa.gov/linux/drivers/tulip.html
*/
+#define HAVE_PRIVATE_IOCTL
+
#define SMP_CHECK
static const char version[] = "tulip.c:v0.89H 5/23/98 becker@cesdis.gsfc.nasa.gov\n";
@@ -163,6 +165,9 @@
int tulip_debug = 1;
#endif
+static int defer_jiffies = 0;
+void defer_netif_rx(struct sk_buff* skb, unsigned long when);
+
/*
Theory of Operation
@@ -2452,7 +2457,10 @@
#else
skb->len = pkt_len;
#endif
- netif_rx(skb);
+ if (defer_jiffies==0)
+ netif_rx(skb);
+ else
+ defer_netif_rx(skb,jiffies+defer_jiffies);
dev->last_rx = jiffies;
tp->stats.rx_packets++;
#if LINUX_VERSION_CODE > 0x20127
@@ -2484,6 +2492,27 @@
return work_done;
}
+struct defer_entry {
+ struct sk_buff* skb;
+ struct timer_list timer;
+};
+
+static void defer_timer(unsigned long data)
+{ struct defer_entry* e = (struct defer_entry*)data;
+ netif_rx(e->skb);
+ kfree((void*)e->timer.data); }
+
+void defer_netif_rx(struct sk_buff* skb, unsigned long when)
+{ struct defer_entry* e;
+ e = (struct defer_entry*)kmalloc(sizeof(struct defer_entry), GFP_ATOMIC);
+ e->skb = skb;
+ e->timer.next = NULL;
+ e->timer.prev = NULL;
+ e->timer.expires = when;
+ e->timer.data = (unsigned long)e;
+ e->timer.function = &defer_timer;
+ add_timer(&e->timer); }
+
static int
tulip_close(struct device *dev)
{
@@ -2619,6 +2648,9 @@
mdio_write(dev, data[0] & 0x1f, data[1] & 0x1f, data[2]);
restore_flags(flags);
}
+ return 0;
+ case SIOCDEVPRIVATE+3:
+ defer_jiffies = *((u32*)data);
return 0;
default:
return -EOPNOTSUPP;
------------------------------
configuration tool:
(usage: defer_config <interface-name> <time in jiffies>)
#include <stdio.h>
#include <fcntl.h>
#include <net/if.h>
#include <ioctls.h>
main(int argc, char* argv[])
{ int r;
int len;
struct ifconf ifc;
unsigned char buf[100*sizeof(struct ifreq)];
struct ifreq *ifr;
unsigned char* ptr;
int sockfd;
int defer_jiffies;
defer_jiffies = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd<0) {
fprintf(stderr,"couldn't open socket\n");
exit(1); }
ifc.ifc_len = 100*sizeof(struct ifreq);
ifc.ifc_buf = buf;
r = ioctl(sockfd,SIOCGIFCONF,&ifc);
if (r<0) {
fprintf(stderr,"SIOCGIFCONF failed\n");
exit(1); }
for (ptr=buf; ptr<buf+ifc.ifc_len; ) {
ifr = (struct ifreq *)ptr;
len = sizeof(struct sockaddr);
ptr += sizeof(ifr->ifr_name) + len;
if (strcmp(argv[1],ifr->ifr_name)==0) {
ifr->ifr_data = defer_jiffies;
fprintf(stderr,"setting %s defer %d\n",ifr->ifr_name,ifr->ifr_data);
r = ioctl(sockfd, SIOCDEVPRIVATE+3, ifr);
if (r<0) {
fprintf(stderr,"socket ioctl failed\n");
exit(1); } } } }
-
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