[Xen-users] Many Tx dropped packets

["Vincenzo Farruggia" <f.vincenzo@xxxxxxxxx>]

Hi,
I have 3 xen box with 2-3 VM on each.
Each server has 2 nic (1 for external and 1 for internal network).
All VMs are webserver and they mount a nfs filesystem.
I've noticed that on each dom0 there are many dropped packets.
Server config is:
1- DELL (2xQuad Xeon E5320 @1.86Ghz - 8Gb Ram - Perc5 - Kernel 2.6.18-6 (debian etch)) 
2- DELL (2xDual Xeon 5110 @1.60Ghz - 4Gb Ram - Perc5 - Kernel 2.6.18-6 (debian etch))
3 - 2xOpteron 242 @ 1,60Ghz - 2Gb Ram - 3ware raid controller - kernel 2.6.18-6 (debian etch))

This is my ifconfig output for the first server (the other 2 are almost same):
eth0      Link encap:Ethernet  HWaddr 00:1d:09:64:5f:24  
          inet6 addr: fe80::21d:9ff:fe64:5f24/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:245795 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0   
          collisions:0 txqueuelen:0                              
          RX bytes:40862474 (38.9 MiB)  TX bytes:468 (468.0 B)   

eth1      Link encap:Ethernet  HWaddr 00:1d:09:64:5f:22  
          inet addr:xx.yy.1.69  Bcast:xx.yy.1.255  Mask:255.255.255.0
          inet6 addr: fe80::21d:9ff:fe64:5f22/64 Scope:Link              
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1             
          RX packets:479842 errors:0 dropped:0 overruns:0 frame:0        
          TX packets:198275 errors:0 dropped:0 overruns:0 carrier:0      
          collisions:0 txqueuelen:0                                      
          RX bytes:192767731 (183.8 MiB)  TX bytes:21411435 (20.4 MiB)   

vm1     Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff  
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 
          RX packets:1194712 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1508990 errors:0 dropped:223 overruns:0 carrier:0
          collisions:0 txqueuelen:0                                   
          RX bytes:99855963 (95.2 MiB)  TX bytes:1003008460 (956.5 MiB)

vm2     Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff  
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 
          RX packets:116748356 errors:0 dropped:0 overruns:0 frame:0
          TX packets:94485672 errors:0 dropped:224545 overruns:0 carrier:0
          collisions:0 txqueuelen:0                                       
          RX bytes:68131399991 (63.4 GiB)  TX bytes:51427565429 (47.8 GiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host     
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:19 errors:0 dropped:0 overruns:0 frame:0
          TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0                            
          RX bytes:1684 (1.6 KiB)  TX bytes:1684 (1.6 KiB)     

peth0     Link encap:Ethernet  HWaddr 00:1d:09:64:5f:24
          inet6 addr: fe80::21d:9ff:fe64:5f24/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1531831 errors:1 dropped:0 overruns:0 frame:1
          TX packets:1194720 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1010983841 (964.1 MiB)  TX bytes:121870721 (116.2 MiB)
          Interrupt:16 Memory:f4000000-f4011100

peth1     Link encap:Ethernet  HWaddr 00:1d:09:64:5f:22
          inet6 addr: fe80::21d:9ff:fe64:5f22/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:95000175 errors:2 dropped:0 overruns:0 frame:2
          TX packets:116918856 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:52438104794 (48.8 GiB)  TX bytes:70395166347 (65.5 GiB)
          Interrupt:16 Memory:f8000000-f8011100

vm3    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:771 errors:0 dropped:0 overruns:0 frame:0
          TX packets:570250 errors:0 dropped:25082 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:79742 (77.8 KiB)  TX bytes:211507576 (201.7 MiB)

vm4   Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1660 errors:0 dropped:0 overruns:0 frame:0
          TX packets:110937 errors:0 dropped:12414 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1521641 (1.4 MiB)  TX bytes:56440105 (53.8 MiB)

There're a bridge for each nic:
> brctl show
bridge name     bridge id               STP enabled     interfaces
eth0            8000.001d09645f24       no              vm1
                                                                           peth0
eth1            8000.001d09645f22       no              vm2
                                                                            peth1
                                                                            vm3
                                                                            vm4
I've also enabled arp_filtering with:
echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter

And i've disabled tx checsum with:
ethtook -K for every network interface in dom0 and on domU

Can anyone help me?
Thank's a lot.
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