[Xen-users] physical network card assigned to the domU can optimize the performance?

[kazabe <kazabe@xxxxxxxxx>]

hi.

I have a SAMBA PDC on a domU.  The users are experimenting low performance when use the apps stored in the server (access databases).

The first discard was assign exclusives CPU's to the domU.

kernel      = '/boot/vmlinuz-2.6.26-1-xen-686'

ramdisk     = '/boot/initrd.img-2.6.26-1-xen-686'

memory      = '2048'

cpus        = '4-6'

vcpus        = '3'

Initially i was use file-backed image, but change all to physical partition and tap:aio images.

This is my actual config:

root        = '/dev/sda2 ro'

disk        = [

                  'tap:aio:/opt/xen/domains/samba/swap.img,sda1,w',

 'phy:/dev/sda6,sda2,w',

 'tap:aio:/opt/xen/domains/samba/home.img,sda3,w',

 'phy:/dev/disco-c/disco-c,sda4,w',

Now all the performance test show very good results, but the users continue experimenting slow access.

i run that command on domU

ethtool -K eth0 tx off

and apparently the performance was improved.

My last idea is dedicate a physical network card to that domU.  But really that can optimize the access?

I have 3 domUs in the same server, but the samba require the best access, because all the users work permanently on that (the others domUs are mail server and Web server).

really assign a dedicated network card to the domU can optimize the access?

Any another idea to discard?

thanks and regards.

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