>> Sending and receiving 100.000 pakets results to a 
>> dom0-memory-consumption increasement of about 5 MB!
>>     
>
> When you've shipped a few million packets through the machine please
> post the output of /proc/slabinfo
>   
Okay, I shipped arround 3million packets and here are the results (see
attached files).
slabinfo_a is the output before the tests and slabinfo_b is after the tests.

Here the output of free before..
             total       used       free     shared    buffers     cached
Mem:        700416      61288     639128          0       2984      19268
-/+ buffers/cache:      39036     661380
Swap:            0          0          0

and after the test:
             total       used       free     shared    buffers     cached
Mem:        700416     258388     442028          0       2996      19392
-/+ buffers/cache:     236000     464416
Swap:            0          0          0


I used floodping to generate the packets and found that the interface
stats for peth0 in dom0 are not correct either.

domU eth0 shows:
eth0      Link encap:Ethernet  HWaddr 00:16:3E:05:B2:64 
          inet addr:192.168.37.2  Bcast:192.168.37.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3000075 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3000028 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:294006770 (280.3 MiB)  TX bytes:294001488 (280.3 MiB)

rx bytes and tx bytes is nearly the same.

But in dom0:
peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF 
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:3000123 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3000078 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:294010467 (280.3 MiB)  TX bytes:306006234 (291.8 MiB)
          Interrupt:17 Memory:e8000000-0

rx bytes and tx bytes differ in about 11 MB!

In dom0 nothing else ran, and on the (crossovered) pinged host, rx and
tx are also the same:

eth1      Link encap:Ethernet  HWaddr 00:0E:0C:22:0E:55 
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4700954 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4701065 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:479480546 (457.2 MiB)  TX bytes:479508173 (457.2 MiB)
          Base address:0x9400 Memory:e6000000-e6020000
(the higher values result from a second test)

I hope this helps!?

Patrick