[Xen-users] minimal CPU and MEM needed for dom0 hosting iSCSI domUs?

[Scott Classen <sclassen@xxxxxxx>]

Hello,

A quick question about whether I've over allocated resources to dom0.

Hardware:
Single Intel Xeon L5630 2.13GHz 4 cores 8 threads
12GB RAM
three 8GB iSCSI LUNs hosted on NetApp filer


I've installed CentOS 5.5 x86_64 xen on dom0 allocated 1024M RAM and 2 VCPUs

~~~~ from grub.conf ~~~~~~
kernel /xen.gz-2.6.18-194.26.1.el5 dom0_mem=1024M dom0_max_vcpus=2 
dom0_vcpus_pin


I have 3 domUs also running CentOS 5.5 with ~2GB RAM and 2 VCPUs



~~~~~~ example of xen config file ~~~~~~
name="xen1"
memory="2048"
maxmem="2750"
disk=[ "phy:/dev/sdb,xvda,w" ]
vif=[ "mac=00:16:3e:00:00:01,bridge=xenbr0,script=vif-bridge" ]
vcpus="2"
cpus="2-7"
bootloader="/usr/bin/pygrub"
on_poweroff="destroy"
on_reboot="restart"
on_crash="restart"



Now when I stress out the 3 domUs using


stress --cpu 10 --io 10 --vm 10 --timeout 360s


I generate tremendous load on the domUs, but nothing on dom0. there is 
practically no CPU activity, load, or memory usage on dom0.

If I'm using iSCSI disks for the domUs then is there any reason to dedicate 
resources to dom0? what else is dom0 doing? could I get away with 1 VCPU and 
256M RAM?

Cheers,
Scott




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