Re: [Xen-devel] testing the balloon driver

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

The balloon driver is not at all polite about rate-limiting its
allocations. This needs fixing (e.g., rate limit to a page per jiffy).

 -- Keir

> Am I mean?  Maybe a little...
> 
> Anyway, I'm now running the following test of the balloon driver
> with 2.6.8.1 and the latest Xen tree, on a 128MB domain 0 and a
> 64MB domain 1:
> 
> # while sleep 1 ; do xm balloon 0 `echo $((($RANDOM % 64) + 60))`; done &
> # while sleep 1 ; do xm balloon 1 `echo $((($RANDOM % 32) + 30))`; done & 
> 
> Simultaneously, I'm running yum inside domain 1, putting a load
> on the loop device driver in domain 0 and the VM inside domain 1.
> 
> This causes a number of page allocation failures inside domain 1,
> as well as:
> 
> VM: killing process yum
> 
> I'm off to investigate whether it's a VM bug, or whether I should
> make the balloon driver a little friendlier on the VM.  Chances
> are I'll end up sending out a patch later, either here or to the 
> linux-kernel mailing list ;)
> 
> -- 
> "Debugging is twice as hard as writing the code in the first place.
> Therefore, if you write the code as cleverly as possible, you are,
> by definition, not smart enough to debug it." - Brian W. Kernighan
> 
> 
> 
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