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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