Thanks for the very informative post Jayson,
All is sweet on my end now.
P.S. Good to see some other Gentoo/Xen users out there
On Mon, 21 May 2007 20:33:19 -0700
Jayson Vantuyl <jvantuyl@xxxxxxxxxxxxxx> wrote:
> The parameter is maxmem, not max-mem. That could be part of it.
> You can get a complete list of options from "xm create
> --help_config". When I found this out it was a huge help for me.
> Also, it is important that you NOT specify mem=XXX on the kernel
> commandline (via the extra option). That would completely break
> this behavior. In other works, DO NOT specify anything like
> One other thing I've done that may affect this is that I have
> limited my Dom0 memory at boot time. Perhaps if it has to borrow the
> memory from the Dom0 it stops short. I do this by passing the
> hypervisor the parameter dom0_mem=524288.
> Here's the relevant section of my grub.conf:
> root (hd0,0)
> kernel /boot/xen.gz dom0_mem=524288 com1=38400,8n1 nmi=dom0
> module /boot/vmlinuz-18.104.22.168-xen0 root=/dev/uba1
> netloop.nloopbacks=2 xencons=ttyS libusual.bias="ub"
> And here's a lightly modified copy of the .xen file that I just
> # -*- mode: python; -*-
> kernel = '/boot/vmlinuz-22.214.171.124-xenU'
> memory = 2000
> maxmem = 4096
> name = 'XXX'
> vif = [ 'bridge=xenbr0' ]
> disk = [
> root = '/dev/sda1 ro'
> vcpus = 2
> Here's the output of a session. The dates are to help match up with
> the following screenshots:
> hostname ~ # date ; xm info | grep free
> Mon May 21 20:10:21 PDT 2007
> free_memory : 307
> hostname ~ # xm mem-set XXX 2250 ; date
> Mon May 21 20:12:13 PDT 2007
> hostname ~ # xm mem-set XXX 2000 ; date
> Mon May 21 20:12:43 PDT 2007
> hostname ~ #
> Here are screenshots of before adjusting the memory, after upping
> it, and after dropping it again:
> Here is uname -a from the DomU:
> Linux XXX 126.96.36.199-xenU #1 SMP Mon Mar 26 03:15:23 PDT 2007 x86_64
> Dual Core AMD Opteron(tm) Processor 280 GNU/Linux
> And xm info on the Dom0:
> host : XXW
> release : 188.8.131.52-xen0
> version : #4 SMP Mon Mar 26 22:56:07 PDT 2007
> machine : x86_64
> nr_cpus : 4
> nr_nodes : 1
> sockets_per_node : 2
> cores_per_socket : 2
> threads_per_core : 1
> cpu_mhz : 2394
> hw_caps : 178bfbff:e3d3fbff:
> total_memory : 16319
> free_memory : 307
> xen_major : 3
> xen_minor : 0
> xen_extra : .4-1
> xen_caps : xen-3.0-x86_64
> xen_pagesize : 4096
> platform_params : virt_start=0xffff800000000000
> xen_changeset : Thu Feb 15 11:34:58 2007 +0000
> cc_compiler : gcc version 4.1.1 (Gentoo 4.1.1-r1)
> cc_compile_by : root
> cc_compile_domain : XXW.com
> cc_compile_date : Mon Mar 26 02:54:15 PDT 2007
> xend_config_format : 3
> Hopefully some of this will help somebody...but it really does
> work. I swear!
> On May 21, 2007, at 6:10 PM, suyash jape wrote:
> > Hi everyone , I have also been facing the same problem for the
> > past few days. The max-mem parameter in the domU config file is
> > completely ignored.Even if we specifiy maxmem parameter in the
> > config file at boot time , boot time allocated memory is taken as
> > the max memory possible for the domain.
> > Also i observed that the max vcpu parameter also
> > behaves the same way.
> > VCPU Observations:
> > 1]We can play around with only the no of VCPUs allotted at boot
> > time or less.
> > Allocating max no of VCPUs dynamically is not reflected. i.e we
> > can make max VCPUs of a domain from 5 to 10 dynamically BUT the 5
> > new ones are never used...they are always paused (possibly a bug
> > in open source xen ?)
> > Is there a fix around these problems?
> > Thanks.....
> > Suyash
> > Paul Archer <tigger@xxxxxx> wrote:
> > > I have been playing with memory= and maxmem=, but I'm not seeing
> > what
> > > I think I should be seeing, namely that the memory available to a
> > > domU can be increased on the fly.
> > >
> > >
> > Brad wrote :
> > >I wasn't able to achieve this using xen-3.1. The maximum amount
> > >of
> > RAM appears to be dictated by the value that >the machine is
> > booted with. Has anyone else managed to increase the amount of
> > memory allocated to a domU to >more than what the domU was booted
> > with and have the domU utilise this memory? I.e. show up with free
> > -m on the
> > >domU?
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
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