tc qdisc add dev eth3 parent 1:1 handle 2: cbq bandwidth 100Mbit avpkt 1000 cell 8
But there's no telling which.
Sent: Wed 5/12/2007 7:07 PM
To: Leigh Sharpe
Cc: lartc@xxxxxxxxxxxxxxx; Linux Netdev List
Subject: Re: Adding qdiscs crashes kernel??
Please always report bugs to
netdev@xxxxxxxxxxxxxxxx
Leigh Sharpe wrote:
> Oh,
> kernel
version 2.6.23, since I forgot to mention it.
>
>
Leigh.
>
> ________________________________
>
> From:
lartc-bounces@xxxxxxxxxxxxxxx
> [mailto:lartc-bounces@xxxxxxxxxxxxxxx]
On Behalf Of Leigh Sharpe
> Sent: Wednesday, 5 December 2007 3:37
PM
> To: lartc@xxxxxxxxxxxxxxx
> Subject: Adding qdiscs
crashes kernel??
>
>
> Hi all,
> I'm having some
problems setting up qdiscs on a bridge.The config looks
> a little like
this:
>
>
> ifconfig ifb0
up # Bring up the IFB for this
bridge.
> tc qdisc add dev eth2 ingress
> tc qdisc add dev eth3
ingress
> tc qdisc add dev ifb0 root handle 1:0 cbq bandwidth 100Mbit
avpkt 1000
> cell 8
> # Raw qdiscs on each bridge port
> tc
qdisc add dev eth2 root handle 1:0 cbq bandwidth 100Mbit avpkt 1000
> cell
8
> tc qdisc add dev eth3 root handle 1:0 cbq bandwidth 100Mbit avpkt
1000
> cell 8
>
> tc filter add dev eth2 parent 1: protocol
0x8100 prio 5 u32 match u16
> 3000 0x0fff at 0 flowid 1:1 action ipt -j
MARK --or-mark 0x01000000 #
> mark packets for VLAN 3000.
> tc
filter add dev eth3 parent 1: protocol 0x8100 prio 5 u32 match u16
> 3000
0x0fff at 0 flowid 1:1 action ipt -j MARK --or-mark 0x01000000 #
> mark
packets for VLAN 3000.
>
> tc class add dev eth2 parent 1:0
classid 1:1 cbq bandwidth 100Mbit rate
> 2000Kbit weight 200Kbit prio 1
allot 1514 cell 8 maxburst 20 avpkt 1000
> bounded
isolated # 2000 Kbit rate limit on entry
point.
> tc class add dev eth3 parent 1:0 classid 1:1 cbq bandwidth
100Mbit rate
> 2000Kbit weight 200Kbit prio 1 allot 1514 cell 8 maxburst
20 avpkt 1000
> bounded isolated #
2000 Kbit rate limit on entry point.
>
> tc qdisc add dev eth2
parent 1:1 handle 2: cbq bandwidth 100Mbit avpkt
> 1000 cell
8
> tc qdisc add dev eth3 parent 1:1 handle 2: cbq bandwidth 100Mbit
avpkt
> 1000 cell 8
> tc class add dev eth2 parent 2:0 classid 2:1
cbq bandwidth 100Mbit rate
> 2000Kbit weight 200Kbit prio 2 allot 1514
cell 8 maxburst 20 avpkt 1000
> sharing
> tc filter add dev eth2
parent 2:0 protocol 0x8100 prio 2 u32 match u16
> 3000 0x0fff at 0 flowid
2:1 action ipt -j MARK --or-mark 0x00100000
> tc qdisc add dev eth2 parent
2:1 handle 3: cbq bandwidth 100Mbit avpkt
> 1000 cell
8
> tc filter add dev eth2 parent 3:0 protocol 0x8100
prio 4 u32 match u32 0
> 0 flowid
3:3
# Traffic
> class 3 - catchall. Don't MARK further.
>
>
(There's lot's more, mostly a repeat of the above with different
>
criteria.)
> When I first boot the box, and apply the traffic shaping
before any
> traffic flows, all is fine. However, if I apply this same
config whilst
> the bridge is passing lots of traffic, it completely
crashes the box.
> Everything freezes, I don't even get a kernel panic
message on the
> console. Nothing responds and the only way to recover is
by a
> power-cycle.
>
> If I take the link down on the
ethernet port (with ip link set ethx
> down), apply the configs, and then
bring it back up again, all is OK.
> Obviously, though, this isn't really
acceptable.
>
> It always crashes immediately after a 'tc
qdisc add...' line, but not
> always in the same place. Are there any
known issues with adding qdiscs
> whilst traffic is being queued on
it?
> I've also tried it using HTB instead of CBQ, and I get the same
results.
>
> Anybody got any other ideas as to what might be
going on?
Which qdisc add crashes it? Please post the full
oops.
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