Hi Stephen
> Most likely, you have created a loop and are not running spanning
tree. When a loop happens, packets multiply until all > resources are
exhausted.
> you have created a loop.
Ya, I have bridge named br-lan created by($brctl), and I have attached
two interfaces to it, and I'm sending traffic from PC1 to PC2. Some
thing like this
-----------------------
| ------------ |
| | br-lan | | <--- AP
| ------------ |
| eth0.0 eth0.1 |
----|------------|-----
| |
| |
PC1 PC2
Previously:
root@none:/$ brctl show
bridge name bridge id STP enabled interfaces
br-lan 8000.001570d8d8fd no eth0.0
eth0.1
>are not running spanning tree.
Is it always necessary to enable spanning tree when traffic is sent over
loop?
I have enabled spanning tree using
root@none:/$ brctl stp br-lan on
root@none:/$ brctl show
bridge name bridge id STP enabled interfaces
br-lan 8000.001570d8d8fd yes eth0.0
eth0.1
But again, when huge traffic is pumped from PC1 to PC2, The
skbuff_head_cache value is increased rapidly and even after stop pumping
the traffic, this value doesn't come down, and system goes for crash or
reboot because of out of memory.
root@none:/$ cat /proc/slabinfo | grep skbuff_head
skbuff_head_cache 4560 4560 192 20 1 : tunables 120 60
0 : slabdata 228 228 0
One more point, say I have each port attached to there own bridge, and
when I route traffic from one host to other, I'll not face this
behavior, This behavior is relevant only in above case.
Do I have to do any other setting to overcome out of memory problem?
Also, Please let me know if any other information is required to isolate
this behavior.
Thanks,
Sharad.
-----Original Message-----
From: Stephen Hemminger [mailto:shemminger@xxxxxxxxxx]
Sent: Monday, April 13, 2009 10:00 AM
To: Tekale Sharad-FHJN78
Cc: bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx
Subject: Re: Out of memory problem
On Mon, 13 Apr 2009 16:58:20 +0800
"Tekale Sharad-FHJN78" <FHJN78@xxxxxxxxxxxx> wrote:
> Hi, I'm using linux 2.6.21.5 and our kernel is freeze.
>
> The problem is, if I create a Software bridge using $brctl command.
> and add two interfaces say, eth0.0 and eth0.1 using
>
> $brctl addbr br-lan
> $brctl addif br-lan eth0.0
> $brctl addif br-lan eth0.1
>
> and when i send traffic from a host connected to one port to host
> connected at other end, soon all the memory is dried up and and kernel
> crashes, then oom-killer gets invoked which kills all the processes
> finally system reboots.
>
> Can any one help me to refer to some patch or point some location in
> code from where memory is failed to deallocate.
>
> Thanks,
> Sharad.
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