Re: skbuf problem
- From: Iwo Mergler <Iwo.Mergler@xxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 29 Mar 2007 13:34:54 +0100
Dimitri.Kim@xxxxxxxxx wrote:
Hello all,
I wonder what make skbuf exhausted - asymetric routing, many syn
packets, traffic flood(many pps) ???? I have two linux firewals.
One(A) of both has skbuf problem. Sometimes there is no skbuf, so I
can see a lot of RX dropped packets and network is down as well.
It's really weird becuase the other machine(B) normally is under
heavy
traffic than A machine but it's working properly and there is no
issue
like that skbuf is exhausted.
Any idea what caused skbuf exhaust and how to fix it?
cat /proc/net/skb_stat
Limit Remaining Dropped.
40000 0 3290123
Thanks,
Dimitri
skbs get allocated as needed, so you need to run
out of kernel memory to run out of skbs.
However, the large number of dropped packets when this
happens suggests a skb leak somewhere in the kernel or
driver. Those dropped skbs add up to about 100-600MB of
memory.
It is quite common that error handling code has more bugs
than other code. Your case looks like the packet dropping
code does not free the skbs properly.
Kind regards,
Iwo
.
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