On Thursday 04 August 2005 23:45, Tommy Christensen wrote:
> Denis Vlasenko wrote:
> > Hi,
> >
> > As reported earlier, sometimes my home box don't want
> > to send anything.
> >
> > # ip r
> > 1.1.5.5 dev tun0 proto kernel scope link src 1.1.5.6
> > 1.1.4.0/24 dev if proto kernel scope link src 1.1.4.6
> > default via 1.1.5.5 dev tun0
> > # ping 1.1.4.1 -i 0.01
>
> > 2005-08-02_19:12:18.19551 kern.info: qdisc_restart: start, q->dequeue=c03e8662
> > 2005-08-02_19:12:19.19536 kern.info: qdisc_restart: start, q->dequeue=c03e8662
> >
> > System.map:
> > c03e8662 t noop_dequeue
> >
> > I guess this explains why I do not see calls to pfifo_fast_dequeue! :)
> > But how come my interface is using noop queue, is a mystery to me.
>
> Because link is down. Or at least the kernel thinks so.
>
> > # ip l
> > 1: if: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
> > link/ether 00:0a:e6:7c:dd:79 brd ff:ff:ff:ff:ff:ff
> > 2: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
> > link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> > 17: tun0: <POINTOPOINT,MULTICAST,NOARP,UP> mtu 1464 qdisc pfifo_fast qlen 100
> > link/[65534]
> >
> > As you can see, ip l reports that iface 'if' uses pfifo_fast, not noop...
>
> Yeah, a bit confusing. pfifo_fast is the *configured* qdisc, but in this
> case it is not the *active* qdisc. The qdisc is set to noop when carrier
> is lost.
>
> > Any ideas?
>
> Try tracking the calls to netif_carrier_on/off.
Your analysis is correct. I just caught it again. diff between logs:
/* Basic mode status register. */
#define BMSR_ERCAP 0x0001 /* Ext-reg capability */
#define BMSR_JCD 0x0002 /* Jabber detected */
#define BMSR_LSTATUS 0x0004 /* Link status */
#define BMSR_ANEGCAPABLE 0x0008 /* Able to do auto-negotiation */
#define BMSR_RFAULT 0x0010 /* Remote fault detected */
#define BMSR_ANEGCOMPLETE 0x0020 /* Auto-negotiation complete */
#define BMSR_RESV 0x07c0 /* Unused... */
#define BMSR_10HALF 0x0800 /* Can do 10mbps, half-duplex */
#define BMSR_10FULL 0x1000 /* Can do 10mbps, full-duplex */
#define BMSR_100HALF 0x2000 /* Can do 100mbps, half-duplex */
#define BMSR_100FULL 0x4000 /* Can do 100mbps, full-duplex */
#define BMSR_100BASE4 0x8000 /* Can do 100mbps, 4k packets */
9 = 1001 - link down
D = 1101 - link up
--- klog Sun Aug 7 14:21:20 2005
+++ klog2 Sun Aug 7 14:21:29 2005
@@ -125,7 +125,7 @@
kern.warn: PCI: setting IRQ 11 as level-triggered
kern.info: ACPI: PCI Interrupt 0000:00:12.0[A] -> Link [LNKA] -> GSI 11 (level, low) -> IRQ 11
kern.info: eth0: VIA Rhine II at 0x1e800, 00:0a:e6:7c:dd:79, IRQ 11.
-kern.info: eth0: MII PHY found at address 1, status 0x7849 advertising 05e1 Link 0000.
+kern.info: eth0: MII PHY found at address 1, status 0x784d advertising 05e1 Link 0000.
^^^^^^
Here. It thinks that link is down.
I will run ethtool next time...
kern.warn: cs89x0:cs89x0_probe(0x0)
kern.warn: PP_addr=0xffff
kern.err: eth1: incorrect signature 0xffff
@@ -287,13 +287,27 @@
kern.info: ACPI: PCI Interrupt 0000:00:11.5[C] -> Link [LNKC] -> GSI 10 (level, low) -> IRQ 10
kern.debug: PCI: Setting latency timer of device 0000:00:11.5 to 64
kern.warn: netdev tun0: qdisc = pfifo_fast_qdisc
-kern.warn: qdisc_restart: start, q->dequeue=c03e8662
-kern.warn: qdisc_restart: start, q->dequeue=c03e8662
-kern.warn: qdisc_restart: start, q->dequeue=c03e8662 <== noop
+kern.warn: pfifo_fast_enqueue returns 0
+kern.warn: qdisc_restart: start, q->dequeue=c03e8752 <== pfifo_fast
+kern.warn: pfifo_fast_dequeue returns a skb
+kern.warn: qdisc_restart: skb!=NULL
+kern.warn: qdisc_restart: start, q->dequeue=c03e8752
+kern.warn: pfifo_fast_dequeue returns NULL
+kern.warn: pfifo_fast_enqueue returns 0
+kern.warn: qdisc_restart: start, q->dequeue=c03e8752
+kern.warn: pfifo_fast_dequeue returns a skb
+kern.warn: qdisc_restart: skb!=NULL
+kern.warn: qdisc_restart: start, q->dequeue=c03e8752
+kern.warn: pfifo_fast_dequeue returns NULL
kern.warn: pfifo_fast_enqueue returns 0
kern.warn: pfifo_fast_dequeue returns a skb
kern.warn: pfifo_fast_dequeue returns NULL
-kern.warn: qdisc_restart: start, q->dequeue=c03e8662
+kern.warn: pfifo_fast_enqueue returns 0
+kern.warn: qdisc_restart: start, q->dequeue=c03e8752
+kern.warn: pfifo_fast_dequeue returns a skb
+kern.warn: qdisc_restart: skb!=NULL
+kern.warn: qdisc_restart: start, q->dequeue=c03e8752
+kern.warn: pfifo_fast_dequeue returns NULL
kern.info: usbcore: registered new driver usbfs
...
--
vda
-
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