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From: Robin Lee Powell <rlpowell@digitalkingdom.org>
To: Emmanuel Noobadmin <centos.admin@gmail.com>
Cc: kvm@vger.kernel.org
Subject: Re: Re: Questions about duplicate memory work
Date: Mon, 26 Sep 2011 00:18:03 -0700	[thread overview]
Message-ID: <20110926071803.GE18099@stodi.digitalkingdom.org> (raw)
In-Reply-To: <CAAYorB+d7+BsAmc5Q5xwZXetu2T47h5S_0wmiqH5AKSSQTwBcQ@mail.gmail.com>

On Mon, Sep 26, 2011 at 01:49:18PM +0800, Emmanuel Noobadmin wrote:
> On 9/25/11, Robin Lee Powell <rlpowell@digitalkingdom.org> wrote:
> >
> > OK, so I've got a Linux host, and a bunch of Linux VMs.
> >
> > This means that the host *and* all tho VMs do their own disk
> > caches/buffers and do their own swap as well.
> 
> If I'm not wrong, that's why the recommended and current default
> in libvirtd is to create storage devices with no caching to remove
> one layer of duplication.

How do you do that?  I have my VMs using LVs created on the host as
their disks, but I'm open to other methods if there are significant
advantages.

> > I've considered turning off swap on the VMs so all the swapping
> > at least happens in *one place*; I dunno if that's best.
> 
> Not sure it's a good idea. If the VM needs more working memory
> than you allocated, I think it locks up dead if there is
> insufficient swap space. At least that appears to be what happened
> to one of mine.

Good to know, thanks.

-Robin

  reply	other threads:[~2011-09-26  7:18 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-25  4:45 Questions about duplicate memory work Robin Lee Powell
2011-09-26  5:49 ` Emmanuel Noobadmin
2011-09-26  7:18   ` Robin Lee Powell [this message]
2011-09-26  8:15     ` Emmanuel Noobadmin
2011-09-26  9:14       ` Mihamina Rakotomandimby
2011-09-27  7:38       ` Re: [kvm] " Robin Lee Powell
2011-09-27  8:41         ` Emmanuel Noobadmin
2011-09-27  8:48           ` Robin Lee Powell
2011-09-27  9:00             ` Robin Lee Powell
2011-09-27  9:49               ` Avi Kivity
2011-09-29  0:11                 ` Robin Lee Powell
2011-09-29  0:14                   ` Re: [kvm] " Robin Lee Powell
2011-09-29 17:22                     ` Marcelo Tosatti
2011-09-29 18:46                       ` Re: [kvm] " Robin Lee Powell
2011-10-02  8:56                         ` Avi Kivity

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