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xen-devel
Re: [Xen-devel] network dropouts
Keir Fraser wrote:
no, I'm setting it manually via `ifconfig` in init script. Notice the
following lines in kernel log:
Dec 12 20:33:23 zirafa xen-br0: port 1(eth0) entering disabled state
Dec 12 20:34:23 zirafa xen-br0: port 1(eth0) entering learning state
Why is eth0 (the only physical device in xen-br0) getting into disabled
state?
My guess would be that the bridge code is receiving carrier-change
events from eth0. This causes it to put eth0 in disabled state for a
while.
One way to check this would be to add some printk()'s to
net/bridge/br_notify.c and see whether you are getting NETDEV_CHANGE
or NETDEV_DOWN events. If so, it may be that your physical connection,
or your router/switch/hub, is a bit dodgy.
None of the other paths via which the interface may get disabled seem
very likely to occur, but we can look at those if it doesn't appear
that you are getting NETDEV events.
Hi, I finally managed to get it. Here is my patch to net/bridge/br_notify.c:
--- br_notify.c.original 2004-11-14 15:31:58.000000000 +0100
+++ br_notify.c 2004-12-17 13:57:19.000000000 +0100
@@ -45,37 +45,58 @@
switch (event) {
case NETDEV_CHANGEMTU:
dev_set_mtu(br->dev, br_min_mtu(br));
+ printk("NETDEV_CHANGEMTU\n");
break;
case NETDEV_CHANGEADDR:
br_fdb_changeaddr(p, dev->dev_addr);
br_stp_recalculate_bridge_id(br);
+ printk("NETDEV_CHANGEADDR\n");
break;
case NETDEV_CHANGE: /* device is up but carrier changed */
- if (!(br->dev->flags & IFF_UP))
+ printk("NETDEV_CHANGE ");
+ if (!(br->dev->flags & IFF_UP)) {
+ printk("- !(br->dev->flags & IFF_UP)==true\n");
break;
+ }
if (netif_carrier_ok(dev)) {
- if (p->state == BR_STATE_DISABLED)
+ printk("- netif_carrier_ok(dev)==true ");
+ if (p->state == BR_STATE_DISABLED) {
+ printk("- calling br_stp_enable_port(p)");
br_stp_enable_port(p);
+ }
} else {
- if (p->state != BR_STATE_DISABLED)
+ printk("- netif_carrier_ok(dev)!=true ");
+ if (p->state != BR_STATE_DISABLED) {
+ printk(" - calling br_stp_disable_port(p)");
br_stp_disable_port(p);
+ }
}
+ printk("\n");
break;
case NETDEV_DOWN:
- if (br->dev->flags & IFF_UP)
+ printk("NETDEV_DOWN ");
+ if (br->dev->flags & IFF_UP) {
+ printk("- calling br_stp_disable_port(p)");
br_stp_disable_port(p);
+ }
+ printk("\n");
break;
case NETDEV_UP:
- if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP))
+ printk("NETDEV_UP ");
+ if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
+ printk("- calling br_stp_enable_port(p)");
br_stp_enable_port(p);
+ }
+ printk("\n");
break;
case NETDEV_UNREGISTER:
+ printk("NETDEV_UNREGISTER\n");
spin_unlock_bh(&br->lock);
br_del_if(br, dev);
goto done;
and messages from syslog (obviously my patch is wrong as it'ss putting
several messages together (missing "\n")):
Dec 17 18:37:02 zirafa NETDEV_CHANGE - netif_carrier_ok(dev)!=true -
calling br_stp_disable_port(p)<6>xen-br0: port 1(eth0) entering disabled
state
Dec 17 18:37:02 zirafa
Dec 17 18:38:02 zirafa NETDEV_CHANGE - netif_carrier_ok(dev)==true -
calling br_stp_enable_port(p)<6>xen-br0: port 1(eth0) entering learning
state
Dec 17 18:38:02 zirafa
Dec 17 18:38:02 zirafa xen-br0: topology change detected, propagating
Dec 17 18:38:02 zirafa xen-br0: port 1(eth0) entering forwarding state
However, `ifconfig` says 0 for carrier:
eth0 Link encap:Ethernet HWaddr 00:10:4B:B6:BD:0E
inet addr:10.18.6.60 Bcast:10.18.6.63 Mask:255.255.255.192
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3382 errors:0 dropped:0 overruns:0 frame:0
TX packets:3164 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:312112 (304.7 Kb) TX bytes:334955 (327.1 Kb)
Interrupt:11 Base address:0xe400
xen-br0 Link encap:Ethernet HWaddr 00:10:4B:B6:BD:0E
inet addr:10.18.6.60 Bcast:10.18.6.63 Mask:255.255.255.255
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3186 errors:0 dropped:0 overruns:0 frame:0
TX packets:2971 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:246738 (240.9 Kb) TX bytes:307288 (300.0 Kb)
Xen box has 3c590 card which is connected by cat5 1m long patch cable
into TP-Link TL-SL3210 managable switch (which has 8*100Mbps, 1*1Gbps
and 1 GBIC slot) which was quite expensive, so I don't think it's such a
piece of s*** :-), but I might be mistaken (hope I am not).
Possible workaround could be setting up routing between domain0 and
other domains, but it won't be a simple task.
TIA,
jkt
--
cd /local/pub && more beer > /dev/mouth
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