Ralph wrote:
> We have here a similar problem. A Linux box with Kernel 2.4.34 and
> Openswan 2.4.6 have a redundantly internet connection. From some net's
> we get all packets two times. That is not the normal condition but if
> we transmit data through a tunnel to this net's we loses memory. The
> skbuff_head_cache in /proc/slabinfo increase and the free memory decrease.
> 
>  Active / Total Objects (% used)    : 1244665 / 1247679 (99.8%)
>  Active / Total Slabs (% used)      : 102622 / 102723 (99.9%)
>  Active / Total Caches (% used)     : 42 / 58 (72.4%)
>  Active / Total Size (% used)       : 394040.96K / 394690.33K (99.8%)
>  Minimum / Average / Maximum Object : 0.02K / 0.32K / 128.00K
> 
>   OBJS ACTIVE  USE OBJ SIZE  SLABS OBJ/SLAB CACHE SIZE NAME
> 
> 570980 570980 100%    0.19K  28549       21    114196K skbuff_head_cache
> 457950 457950 100%    0.25K  30530       16    122120K size-256
>  67670  67670 100%    2.00K  33835        2    135340K size-2048
>  45536  45536 100%    0.50K   5692        8     22768K size-512
> 
> 
>       total         used    free  shared  buffers  cached
> Mem: 515088       490672   24416       0     3276   46092
> -/+ buffers/cache:441304   73784
> 
> If we stop the traffic skbuff_head_cache no longer increase. If the
> increase the traffic the used skbuff_head_cache objects increase in the
> same level.
> 
> If we prevent the double packages (i.e. disconnect on of the carrier
> router) is stops increasing too.
> 
> Any one a hint what we can do?

I guess your routing is at best problematic. I don't think receiving
packets twice is the normal mode of operation. I would start digging for
the reason of the packet duplication.

cheers

Erich



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