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hdfsk5
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PostPosted: Sun Mar 30, 2008 5:55 pm 
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Does the answer of this question change if/when everyone is using Xen?
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Xan
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PostPosted: Sun Mar 30, 2008 10:58 pm 
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It wouldn't, no. The CPUs are still shared in the same way. Every Linode will be able to see all the CPUs in the system instead of just one, which would seem to me to exacerbate the problem, since a single Linode could run away with the whole machine. But in any case, Xen doesn't change that we're all sharing the same CPU power.
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mwalling
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PostPosted: Mon Mar 31, 2008 12:11 am 
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Snipped from #linode this evening:
Quote:
23:13 < tonyyarusso> So there's no real protection against a linode neighbor doing something stupid that overloads it, thus taking your site down?
23:15 < tonyyarusso> I haven't actually heard of it being an issue, but am a bit curious if it's possible.
23:18 <@caker> tonyyarusso: on UML, we utilize the standard Linux CPU scheduler which does a fine job fairly allocating CPU time
23:18 <@caker> tonyyarusso: on Xen, we use Xen's credit scheduler, which does the same thing
23:19 < tonyyarusso> caker: wish I knew something about schedulers... Oh well, I'll take your word for it.
23:19 <@caker> let's put it this way: cpu time is guaranteed
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hdfsk5
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PostPosted: Mon Mar 31, 2008 1:33 pm 
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I've noticed when using VMWare, I can have a guest system's cpu pegged, and yet the host's cpu is not. I was just wondering if this would have been the case with Xen, but I guess it's not?
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