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

[Peter Booth <peter_booth@xxxxxx>]

Alexandr,

Using Xen for a fileserver doesn't make much sense. It's an  
inefficient use of resources.
Peter

Sent from my iPhone

On Jun 25, 2009, at 10:47 AM, "Alexandr R. Ogurtzoff" <iscander@xxxxxxxxx 
> wrote:
> 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
>
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