Re: [Xen-users] Serious performance problems - is Xen not ready for production use?

[aq <aquynh@xxxxxxxxx>]

On 7/14/05, Mark Williamson <mark.williamson@xxxxxxxxxxxx> wrote:
> <snip>
> 
> > When I had a closer look to the mem line:
> > Mem:    257488K total,   255368K used,     2120K free,      128K buffers
> >
> > ...it looked strange to me. I checked and found my config file for this
> > domain looking like this:
> >
> > ...
> > memory = 128
> > extra = "mem=268435456"
> > ...
> 
> Well spotted!
> 
> > This was left over from my tries to get the "xm balloon" working. I
> > removed the extra line from the config file - and voila, it works... Is
> > this config above wrong at all or is the strange behaviour I found
> > related to the bugs with balloon feature..?
> 
> The config line looks OK at first glance but...  I wonder what units the mem
> parameter expects: if it expects KB then you've just caused it to allocate a
> frame table for an absolutely *huge* physical memory, which would account for
> all the real memory being allocated.
> 

in domain config file, you can give memory parameters this way:
- <number>: memory unit is Byte
- <number>{k.K}: memory unit is Kilobyte
- <number>{m.M}: memory unit is Megabyte
- <number>{g.G}: memory unit is Gigabyte


> I can't guess any better without going through the code - it should hopefully
> become apparent when someone fixes the ballooning problem (does anyone want
> to volunteer for that, btw?  It'd be useful if someone could post a patch.).

i will take a look, if nobody does it before me ;-)

cheers,
aq

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