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Re: [Xen-devel] Three buglets and a question

To: Barry Rountree <rountree@xxxxxxxxxx>
Subject: Re: [Xen-devel] Three buglets and a question
From: Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>
Date: Thu, 05 Aug 2004 04:02:05 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx, mike.wray@xxxxxxxxxx
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> I'm finally up and running again -- thanks once more for the help.  Here are 
> a 
> few notes:
> 1.  The default config has "cpu" commented out and implies that it defaults 
> to 
> -1.  "xm create" won't work unless this line is uncommented and given an 
> explicit value.  

Thanks. cpu=-1 (unpinned) should be a default.
> 2.  The directory /var/run/xend is not created during "make world", "make 
> install", or "make install-twisted".  "xend start" won't fire up without it.

I think 'xend start' should create this automatically. 

> 3.  After issuing "shutdown -h now" in a domain (or, more rudely, "xm 
> destroy") I'm unable to start up again without getting a name conflict error. 
> After running "xm list", however, I can restart without difficulty.

Yep, I've spotted this too.

> From the papers and documentation I've read, xen doesn't have it's own swap 
> file or partition.  This would make sense for QOS -- very hard to guarantee 
> performance numbers for a domain when you don't know if it's been swapped out 
> to disk or not.  
> However, I'm interested in QOS using the virtual timers only -- I don't 
> particularly care about wall clock time (famous last words, I expect... ;-).
> Has any work been done on giving xen it's own swap?

No, we haven't.

You could swap whole VMs in and out using the save/resume stuff,
but the intended mechanism for adjusting domain memory footprints
is the balloon driver (let them page themselves).


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