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xen-devel
Re: [Xen-devel] RAM allocation and miscellaneous questions
> For people that still use linux 2.4 (like me) is there a tutorial or some
> documentation about the ballon driver ?
Documentation, 2.6 support and facilities to control other domain's balloons
using xm in domain 0 are cooking and should be ready shortly.
In the meantime, do:
# echo target_megabytes > /proc/xen/memory_target
To set a new memory footprint. There's a Linux kernel param (mem=..., I
think) for setting the maximum amount of memory a domain can handle, if
larger than it's initial allocation (i.e. if you want to start with x
megabytes but grow it later).
Trying to grow the domain's memory beyond what it's expecting (the initial
allocation or the kernel param if you specified that) will not work.
Use:
# cat /proc/xen/memory_target
To get the current footprint.
HTH,
Mark
> > > I have been wondering why my Domain-0 machine hasn't been using swap!
> > >
> > > :o) So I should just dump that partition?
> >
> > If you've configured swap, domain 0 should be using just like any
> > normal linux kernel. The balloon driver works in dom0 just like
> > any other domain.
>
> It seems logical, but due to the fact that only a few process are running
> ind dom0, swap file don't need to be huge is it ?
>
> > > I suppose I'll have to be very rigorous when
> > > it comes to keeping that domain lean yes? (Especially as I only have
> > > 4GB to play with!). Out side of basic OS functionality, are there any
> > > Xen or LVM2 related processes I have to account for when setting the
> > > amount of RAM I can use for Domain-0?
> >
> > -xen linux kernels don't have any special processes that take any
> > noticeable extra resources.
> >
> > In domain 0 you'll have to worry about the footprint of xend, but
> > it's not that big.
>
> When starting with xen one or two month ago, i've created a dom0 with only
> 32 Mo of ram, and when i launched xend, it was so slow that i tought i had
> a problem.
> I didn't take time to investigate and didn't remember how much memory was
> used and if the system was swaping or not.
> I just have done a test now with my current xen putting 32768 Mo on xen
> command line (not the kernel line in grub).
> And the system booted a bit slower and i suspect that durring the launch of
> xend it has done some swap.
> free return this just after the boot :
> mat@zeus:/$ free
> total used free shared buffers cached
> Mem: 32768 28572 4196 0 0 7172
> -/+ buffers/cache: 21400 11368
> Swap: 506008 312 505696
>
> Having this process:
> 207 ? Ss 0:00 dhclient -e -pf /var/run/dhclient.eth0.pid -lf
> /var/
> 253 ? Ss 0:00 /sbin/syslogd
> 256 ? Ss 0:00 /sbin/klogd
> 261 ? Ss 0:00 /usr/sbin/inetd
> 268 ? Ss 0:00 /usr/sbin/sshd
> 274 ? S 0:00 xfrd
> 275 ? S 0:00 python /usr/sbin/xend start
> 288 ? Ss 0:00 /usr/sbin/cron
> 327 tty1 Ss+ 0:00 /sbin/getty 38400 tty1
> 328 tty2 Ss+ 0:00 /sbin/getty 38400 tty2
> 329 tty3 Ss+ 0:00 /sbin/getty 38400 tty3
> 330 tty4 Ss+ 0:00 /sbin/getty 38400 tty4
> 331 tty5 Ss+ 0:00 /sbin/getty 38400 tty5
> 332 tty6 Ss+ 0:00 /sbin/getty 38400 tty6
> 333 ? Ss 0:00 sshd: mat [priv]
> 335 ? R 0:00 sshd: mat@pts/0
> 336 pts/0 Ss 0:00 -bash
> 344 pts/0 R+ 0:00 ps ax
>
> i guess i could reduce the number of getty and get rid of dhclient (the
> adress of dom0 is a static one ...).
>
> It was my 2cents thoughts ...
> Matthieu
>
>
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