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Forum: Beta Archive Topic: Poor performance on KVM post-beta |
| purrdeta |
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Posted: Thu Jun 18, 2015 10:16 pm
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Replies: 3
Views: 1373
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| If I had to guess, it would be because a bunch of people are migrating and doing benchmarks and generally causing issues on the host. I noticed all of the hosts my KVM nodes are on have a "medium" or "high" load whereas the xen nodes are on hosts with "idle" load. |
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Forum: Beta Archive Topic: Poor performance on KVM post-beta |
| adeflit |
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Posted: Thu Jun 18, 2015 11:27 am
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Replies: 3
Views: 1373
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During the beta we observed a 28% throughput increase on our in-house benchmark, which is basically CPU-bound. Xen scores ~60, KVM scored ~77.
But since KVM went GA, we've observed a massive decline in performance. KVM nodes in London, Newark and Fremont are scoring 21.
Xen nodes are performing as well as ever, so we're sticking with it for the time being. Is anyone else observing this too? Please let me know how we can help diagnose the problem. |
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Forum: Beta Archive Topic: Linode KVM (beta) - Update 2 |
| trippeh |
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Posted: Fri Jun 12, 2015 8:23 pm
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Replies: 13
Views: 5174
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caker wrote: trippeh wrote: Are your backing qemu processes (carefully!) wrapped using say SELinux or AppArmor to mitigate/limit some kinds of guest to host escape bugs? Yes - although I won't go into detail.
Good enough for me
caker wrote: The chipset stuff, mentioned in your previous post, we're looking into.
I'm not a hundred percent sure the Q35 variant is ready for prime time, but its been around for some years now.
Just wondering if it has been considered and dismissed, and if so, why
AHCI seems to work as a disk bus even with the i440fx model though. With NCQ it may get closer to virtio performance. Doing some testing..
But it won't run Win 3.1  |
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Forum: Beta Archive Topic: Linode KVM (beta) |
| andersen |
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Posted: Tue May 12, 2015 12:12 pm
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Replies: 15
Views: 11621
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Just booted up my first "direct-from-disk" image and it was smooth sailing! Performance seems to be on par with my Xen node. Network including IPv6 working like a charm!
I've been with Linode through the UML->Xen days and am excited for the transition to KVM! |
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Forum: General Discussion Topic: Pay per hour ? |
| Piki |
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Posted: Wed Jul 31, 2013 5:30 pm
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Replies: 39
Views: 6133
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| Xen is dead easy too, and so is KVM. I can script both of them to kick off virtual machines on one keypress if I really wanted to. Somehow it's still easier and quicker to setup amazon instances and have a working machine of any type I like within about 25 seconds. I'm not saying that amazon web is the right solution to everything, just that it's very convenient and scales well. My home SATA disks get real slow when you have 4 OS's doing random reading and writing. VMware server was terrible on disk performance and the last I heard VirtualBox was the same. Xen, KVM, and ESX are far better but the disks are still a serious limit. I'm really not one to waste money but I made a conscious decision a while back that if something costs less than the pocket change from my lunch I should not expend thought on that level of cost. If I ... |
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Forum: General Discussion Topic: Pay per hour ? |
| sednet |
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Posted: Wed Jul 31, 2013 4:35 pm
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Replies: 39
Views: 6133
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| ... know you can have a VM up in 30 seconds or less with minimal effort. 2 cents an hour may sound cheap to you rich people, but the word "cheap" doesn't exist in the dictionary of us poor people :wink: Xen is dead easy too, and so is KVM. I can script both of them to kick off virtual machines on one keypress if I really wanted to. Somehow it's still easier and quicker to setup amazon instances and have a working machine of any type I like within about 25 seconds. I'm not saying that amazon web is the right solution to everything, just that it's very convenient and scales well. My home SATA disks get real slow when you have 4 OS's doing random reading and writing. VMware server was terrible on disk performance and the last I heard VirtualBox was the same. Xen, KVM, and ESX are far better but the disks are still a serious limit. I'm really not one to waste money but I made a conscious decision a while back that if something costs less than the pocket ... |
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Forum: General Discussion Topic: [Off Topic] Home server - need advice |
| vonskippy |
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Posted: Wed Nov 07, 2012 6:02 pm
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Replies: 10
Views: 3589
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| I've pretty much migrated all my VM boxes to Bare Metal Hypervisors. The main reason is security - much harder to hack a specialty OS (which is what the core bare metal hypervisor is), then to hack a general OS (which is what KVM runs on top of). Then there's less management/maintenance. The bare metal hypervisor is basically install and forget, the general OS is a never ending patch cycle and security tweaking project. Although there's much debate (and several different benchmarks ... party management tools to work (like ProxMoxVE or Archipel). Speedwise, KVM has made some serious improvements in efficiency, so it's no longer a slam dunk just to pick Xen or ESXi because their better performers, the VM playing field is pretty level performance wise across the entire selections (i.e. ESXi, Xen, KVM, Parallels, and Hyper-V Server). Of course YMMV, so best to setup both ESXi and KVM and see what YOU think is better. |
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Forum: General Discussion Topic: I want the GUI on my Ubuntu server |
| bezerker |
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Posted: Tue Mar 04, 2008 6:03 pm
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Replies: 18
Views: 28140
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| ... it's not an OS that's gui friendly for server needs. And I don't want it to be. I spent 20 minutes this morning trying to wait for the windows and everything to load so i could find and click the options i needed in a w2k3 server to enable performance monitoring, find the culprit, and fix it.... Meanwhile, had it been a linux machine under the same load, I could have consoled into it with a remote kvm (since ssh may time out mid way), queue some commands up to find what's eating the resources, and act on it.. then go about my business knowing that eventually it would get there. But instead I was waiting for it to properly display the gui window etc. |
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Forum: Linode.com Announcements Topic: Jeff Dike and Christopher Aker interviewed by VSM |
| Ciaran |
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Posted: Wed Aug 15, 2007 8:18 am
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Replies: 3
Views: 14541
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| ... hypervisor thingy. So it's a matter of mismatch of technical directions between Xen and where the Linux world is going. And specifically with respect to the Intel VT extensions... B: Mmhmm. J: ...virtualisation extensions... this new thing called kvm, for Kernel Virtual Machine, looks like how the Linux world is gonna interact with VT. I don't know know exactly how to pronounce the name, but Avi Kivity is really... he posted kvm some time in fall; late summer, early fall, I guess, and people ... make User-Mode Linux a plugin for kvm, which should remove most of the overhead that exists in User-Mode Linux today, and I think it's also noteworthy that Jeff has been working on SMP support for UML, which will further improve User-Mode Linux's performance. B: Right, and that'll allow you to do multiple processor--- or...? C: Yes. Right, guests will have multiple, I guess virtual CPUs, but they'll be able to utilise CPUs on the host or [?] on the host as well - 'cuz right now, it's single-threaded. ... |
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Forum: Sales Questions and Answers Topic: Xen: what is the latest? |
| sednet |
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Posted: Sun Apr 22, 2007 12:28 pm
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Replies: 5
Views: 8424
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pclissold wrote: I personally think that Xen was oversold and has failed to meet the expectations generated by the hype.
No way. Xen is the best thing out there. It just needs to mature a little and become a bit more stable.
Xen paravirtualization is faster than physical virtualization as used by KVM. It's a lot faster than UML and vmware server with their various quirks and isn't so awkwardly hardware dependent as vmware ESX.
I found the Xen beta to be really unstable at first but it's worked perfectly for the last few months. No doubt there is a performance improvement too but I can't even tell with the lightweight stuff I run on linode. |
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