[Xen-users] Xen 3.2 Bridge performance problem (debian lenny)

[Alexander Pirsig <alex@xxxxxxxxxx>]

Hello everybody,

at the moment we're have a strange problem during high load on our DOMUs 
Network services became unavailable for a short period connection time 
takes several seconds.
Will the service (tomcat) is still available from inside of the domU 
connections from DOM0 and even from other servers hangs.
If tried to desiable checksuming (ethtool -K eth0 tx off) on DOMUs interface

netstat output DOMU is as follows:

netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
=============================
   231 ESTABLISHED
   259 FIN_WAIT2
     1 LAST_ACK
     6 LISTEN
   340 TIME_WAIT


brctl show on DOM0:
=============
bridge name     bridge id               STP enabled     interfaces
eth0            8000.001ec9edee5e       no              peth0
                                                       vif135.0
                                                       vif144.0
xenbr1          8000.001ec9edee60       no              eth1
xenbr2          8000.0015178538c2       no              eth2
                                                       vif134.0
                                                       vif137.0
xenbr3          8000.0015178538c3       no              eth3
                                                       vif143.0
                                                       vif148.0


One of DOMUs configuration:
=====================
kernel  = '/boot/vmlinuz-2.6.26-2-xen-amd64'
ramdisk = '/boot/initrd.img-2.6.26-2-xen-amd64'
extra='console=hvc0'
memory  = '2400'

vcpus = '8'

#
#  Disk device(s).
#
root    = '/dev/sda1 ro'

disk    = [ 'phy:system/tomcat03-disk,sda1,w', 
'phy:system/tomcat03-swap,sda2,w' ]
#
#  Hostname
#
name    = 'tomcat03'


#
#  Networking
#
vif  = [ 'ip=192.168.0.98,mac=00:16:3E:41:2C:18,bridge=xenbr3' ]

#
#  Behaviour
#
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'



How can I repeat?

Regards,

Alex


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