[Xen-users] Xen network tune for fileserver in DomU

["Alexandr R. Ogurtzoff" <iscander@xxxxxxxxx>]

Hello, gentlemen
I need wise advice about how to tune  network for performance usage
file server under domU
I use bridged network.
On dom0 network settings are:
auto eth0
iface eth0 inet static
address 192.168.1.100
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
up /etc/xen/scripts/network-bridge start bridge=br0 netdev=eth0
up ifconfig br0 up
#up route add default gw 192.168.1.1
gateway 192.168.1.1
dns-nameserver 192.168.1.1

$ brctl show
bridge name bridge id STP enabled interfaces
br0 8000.000c76ba7b5e no peth0
vif1.0
vif2.0

I use two domU instances:
app 192.168.1.110
file 192.168.1.140

... and GlusterFS on file to export filesystem.

then test it if bonnie I got next results:

Version  1.03c      ------Sequential Output------ --Sequential Input- --Random-
                   -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
app.cluster.xe 128M  5623  17 16612   5  1818   3 15254  46 26112   9 123.5   0
file.cluster.x 128M  9854  29 21547   4  3515   3 16907  44 30468   7 188.1   1
iscander       128M 11308  37 11344   1   555   0 10589  33 11306   1  70.1   0
file.cluster.x 128M 22408  74 23801  11 14326   4 18696  43 48676   4 545.8   1
                   ------Sequential Create------ --------Random Create--------
                   -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files:max:min        /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
app.cluster.xen  16   242   4  1106   5   300   4   242   4  1144   6   288   4
file.cluster.xen 16   873   8  4112  11  1009   6   792   8  4351  10  1165   8
iscander         16   565   2  2317   2   764   1   575   2  2546   2   755   1
file.cluster.xen 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++



first one then run on app instance with /data mount from "file" by glusterfs
second then test with /import mount from "file" by itself  by glusterfs
third line is then mount /data to my host in the same LAN (100Mbit)
last is then test _local_ /data on "file" (ext3) localy

I surprised why my external host works faster with mounted share then
internals - I mean located on the same physical node VMs?
How can I tune network stack for Xen and if it really Xen's network
implemenation penalty ?

/etc/xen/app.cluster.xen
# this is autogenerated by Ganeti, please do not edit
#
kernel = '/boot/vmlinuz-2.6-xenU'
ramdisk = '/boot/initrd-2.6-xenU'
memory = 256
vcpus = 1
name = 'app.cluster.xen'
vif = ['mac=aa:00:00:3e:98:e4, bridge=br0']
disk = ['phy:/var/run/ganeti/instance-disks/app.cluster.xen:0,sda,w']
root = '/dev/xvda1'
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
extra = 'console=hvc0'

/etc/xen/file.cluster.xen
# this is autogenerated by Ganeti, please do not edit
#
kernel = '/boot/vmlinuz-2.6-xenU'
ramdisk = '/boot/initrd-2.6-xenU'
memory = 128
vcpus = 1
name = 'file.cluster.xen'
vif = ['mac=aa:00:00:d5:0f:6d, bridge=br0, ip=192.168.1.140']
disk = 
['phy:/var/run/ganeti/instance-disks/file.cluster.xen:0,sda,w','phy:/var/run/ganeti/instance-disks/file.cluster.xen:1,sdb,w','phy:/var/run/ganeti/instance-disks/file.cluster.xen:2,sdc,w']
root = '/dev/xvda1'
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
extra = 'console=hvc0'
--
My best wishes.
Alexandr Ogurtsov.

Linux is very friendly it is just picky who its friends are

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users