The blog I mentioned does mention the page size issue a bit:<div><br></div><div>"<span style="color:rgb(51,51,51);font-family:Arial,Helvetica,sans-serif;font-size:12px;background-color:rgb(255,255,255)">Also, despite claims by our competitors, Transparent Page Sharing will in fact work with large memory pages in guests by breaking those pages into smaller sizes to enable page sharing when the host is under memory pressure."</span><br>
<div class="gmail_quote"><br></div><div class="gmail_quote">On Fri, Jul 12, 2013 at 9:31 AM, Jim Kinney <span dir="ltr"><<a href="mailto:jim.kinney@gmail.com" target="_blank">jim.kinney@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>The ballooning process works pretty well to share memory chunks across VMs. I've used it in KVM. The chunks are all supposedly read-only with copy on write the same as a thin allocation vm clone. So the caching works in your favor.<br>
<br></div>Here's the kicker for running Linux vm on a Linux host: that caching also works in your favor! For windows vm, not at all. But between windows vms it does work.<br><br></div>What I have not seen is how to specify/change page size for allocation/sharing. Is it always a fixed size? Can I get more efficiency from a variable page size? I would think so. a host has glibc in ram as do all VMs using glibc. That save one or more pointers for each vm if all of glibc is a single page. <br>
</div><div class="gmail_extra"><div><div class="h5"><br><br><div class="gmail_quote">On Fri, Jul 12, 2013 at 9:07 AM, Ed Cashin <span dir="ltr"><<a href="mailto:ecashin@noserose.net" target="_blank">ecashin@noserose.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">One early technique (I saw a presentation on it at OSDI 2003, I think) for reclaiming memory from guests was memory ballooning. You can Google for, e.g.,<div>
<br></div><div> vmware ballooning</div><div><br></div><div>... to learn more about it. This blog post talks about some of the other techniques.<br>
</div><div><br></div><div> <a href="http://blogs.vmware.com/virtualreality/2011/02/hypervisor-memory-management-done-right.html" target="_blank">http://blogs.vmware.com/virtualreality/2011/02/hypervisor-memory-management-done-right.html</a><br>
<br>I have no idea, really, about Hyper-V, but these are the most obvious techniques to use, so I assume Hyper-V has to use the same kinds of techniques. I'd be interested to hear about anything original they've come up with.</div>
<div><br><div class="gmail_quote"><div><div>On Fri, Jul 12, 2013 at 8:15 AM, Lightner, Jeff <span dir="ltr"><<a href="mailto:JLightner@water.com" target="_blank">JLightner@water.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>
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<p class="MsoNormal">Given that Linux pre-caches/pre-buffers most memory presented to it what impact if any does this have to memory allocation to a virtual guest for the virtual platform itself? That is to say if one has a mix of Linux and Windows virtual
machines on say Hyper-V or MWare does the memory allocated to each Linux guest become totally unavailable to other guest machines because of this pre-allocation or is oversubscription possible without impacting the guest machines?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">P.S. Don’t tell me not to use Hyper-V unless you can provide documentation it absolutely won’t work for RHELinux guests – I didn’t make the choice and won’t be able to undo it My question is NOT asking which virtualization platform to
use.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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