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Hello,
I'm trying to set dom0 to 4G of memory.
(Let me quickly say I don't know if 4G of RAM for dom0 is good idea, but I thought I would try it, please advise otherwise) :)
My system has 32Gig of memory. (Xeon's with Debian 6.0.5)
Here is my /etc/default/grub
GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=4096M dom0_vcpus_pin"
Here is my /etc/xen/xend-config.sxp
[snip]
# dom0-min-mem is the lowest permissible memory level (in MB) for dom0.
# This is a minimum both for auto-ballooning (as enabled by
# enable-dom0-ballooning below) and for xm mem-set when applied to dom0.
(dom0-min-mem 196)
# Whether to enable auto-ballooning of dom0 to allow domUs to be created.
# If enable-dom0-ballooning = no, dom0 will never balloon out.
(enable-dom0-ballooning no)
# 32-bit paravirtual domains can only consume physical
# memory below 168GB. On systems with memory beyond that address,
# they'll be confined to memory below 128GB.
# Using total_available_memory (in GB) to specify the amount of memory reserved
# in the memory pool exclusively for 32-bit paravirtual domains.
# Additionally you should use dom0_mem = <-Value> as a parameter in
# xen kernel to reserve the memory for 32-bit paravirtual domains, default
# is "0" (0GB).
(total_available_memory 0)
# In SMP system, dom0 will use dom0-cpus # of CPUS
# If dom0-cpus = 0, dom0 will take all cpus available
(dom0-cpus 4)
[snip]
I've updated grub to populate /boot/grub/grub.cfg and then rebooted.
It boots, and then I run top on my dom0 which shows this:
Tasks: 153 total, 1 running, 152 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.1%us, 0.3%sy, 0.0%ni, 96.9%id, 1.8%wa, 0.0%hi, 0.0%si, 0.9%st
Mem: 2267508k total, 1641848k used, 625660k free, 88140k buffers
Swap: 0k total, 0k used, 0k free, 1279128k cached
Why do I only have 2Gig of RAM?
Here are my domU's...
root@xen:/etc/xen# xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 2557 4 r----- 252.0
debian-central 1 1024 2 -b---- 22.2
debian-cms 2 4096 2 -b---- 186.7
debian-ldap 3 1024 2 -b---- 4.6
debian-ts 4 1024 2 -b---- 42.8
redhat-sdsweb 5 4096 4 -b---- 58.7
w2k3-awards 6 2048 2 -b---- 225.4
w2k3-sme 8 2048 2 -b---- 33.5
w2k8-sme 7 2048 2 -b---- 52.6
root@xen:/etc/xen#
root@xen:/etc/xen# xm info
host : xen.sd57.bc.ca
release : 2.6.32-5-xen-amd64
version : #1 SMP Sun May 6 08:57:29 UTC 2012
machine : x86_64
nr_cpus : 24
nr_nodes : 2
cores_per_socket : 6
threads_per_core : 2
cpu_mhz : 2800
hw_caps : bfebfbff:2c100800:00000000:00001f40:029ee3ff:00000000:00000001:00000000
virt_caps : hvm hvm_directio
total_memory : 32704
free_memory : 12115
node_to_cpu : node0:0,2,4,6,8,10,12,14,16,18,20,22
node1:1,3,5,7,9,11,13,15,17,19,21,23
node_to_memory : node0:2172
node1:9942
node_to_dma32_mem : node0:2172
node1:0
max_node_id : 1
xen_major : 4
xen_minor : 0
xen_extra : .1
xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler : credit
xen_pagesize : 4096
platform_params : virt_start=0xffff800000000000
xen_changeset : unavailable
xen_commandline : placeholder dom0_mem=4096M dom0_vcpus_pin
cc_compiler : gcc version 4.4.5 (Debian 4.4.5-8)
cc_compile_by : fw
cc_compile_domain : deneb.enyo.de
cc_compile_date : Thu Jun 21 06:41:09 UTC 2012
xend_config_format : 4
root@xen:/etc/xen#
Thanks for your advice!
Cheers,
Mike
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