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Re: [Xen-devel] Re: [PATCH][HVM] fix VNIF restore failure on HVMguestwit

To: Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH][HVM] fix VNIF restore failure on HVMguestwith heavy workload
From: Steven Hand <Steven.Hand@xxxxxxxxxxxx>
Date: Thu, 12 Apr 2007 19:51:04 +0100
Cc: Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, Steven.Hand@xxxxxxxxxxxx, "Zhai, Edwin" <edwin.zhai@xxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Zhao, Fan" <fan.zhao@xxxxxxxxx>, Steven Hand <steven.hand@xxxxxxxxxxxx>
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In-reply-to: Message from Mark Williamson <mark.williamson@xxxxxxxxxxxx> of "Thu, 12 Apr 2007 19:46:40 BST." <200704121946.40557.mark.williamson@xxxxxxxxxxxx>
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>> Secondly: there is a known issue with save/restore of ballooned domains
>> (HVM or PV) where the balloning is done from within the guest (e.g.
>> by echoing to /proc/xen/balloon). Since this doesn't update the memory
>> target within xenstore, you'll end up 'reverting' the guest memory size to
>> that last set via xm mem-set. The 'fix' is not to do that, i.e. only use
>> the xm or XenAPI to request ballooning.
>Any reason not to have the balloon driver write back to Xenstore if it's 
>used in this way.  Or is it just waiting for a patch to do that?

You also need xend to watch the node and update its internal structures, 
but otherwise that'd be fine. 



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