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VSwap doesn't always help. Most providers are limited on VSwap and hence will still crash it.
And in my experience, in real life it works out that way. Every one of my Xen/KVM lowend boxes has performed consistently well over extended periods of time. Rarely have I found an OpenVz lowend box that matches this level of performance over time (SecureDragon is the one notable exception). Which of course begs the question Why?
I like consistent and reliable performance, and I don't mind paying a bit more for it.
Set the Guest Disk Cache to WriteBack if you want faster write speeds. It will increase your write speeds by over 250MB/s (it boosted ours from 200MB/s to 450MB/s in some tests).
Caused us some memory leak issues though! We have had to switch back to no cache.
KVM for me because I use pfsense
Yep, and other *NIXes.
However, I did try KVM WITH Virtio and performance is close to Xen-PV, however Xen can be deployed fast and it is a stable, thoroughly tested platform.
In no test whatsoever, KVM outperformed Xen-PV in CPU even lagged behind signifficantly, however it does better than Xen-HVM but not signifficant.
M
In openvz, xen or kvm,
show per core or per thread?
Pretty much this. OpenVZ is an amazing project, and I support it completely. Obviously, as I provide it. It is, however, a container pretending to be virtualization. It is going to have shortcomings and it is going to create problems for many common legitimate uses for a virtual machine. For that, we have KVM & Xen HVM.
I have no issues getting almost the exact same results in a VM with virtio that I do on the host node. I frequently use KVM as a back end for my services (WHMCS, SolusVM).
things like http://freevps.us/ovzmem.txt are an issue on openvz without vswap.
We've offered that from day 1... useful for our own backups.
I second this. This is one of reasons I prefer Full Virtualization and KVM is my choice.
Other reasons include support for all (including regular and custom) kernel modules, full iptables support (unlike in OpenVZ where iptables may be broken if correct modules are not loaded at host) and encrypted partition.
@KuJoe Thanks for the tip:) I'm always concerned about data integrity as well when lots of cache is involved, but I'll run a few tests.
ThreeMultiple strikes against OpenVZ:.
.
That said, I do buy OpenVZ VPSs occasionally because they are so cheap.
I've sworn off VServer VPSs, though. EDIS taught me that.
@swsnyder
Correct. Vservers are the bottom of the line. The Vservers from Edis are right for ssh proxies, but everything else fails. OpenVPN, vnstat, etc not working, PPP not possible, killed PHP processes (even if 80MB RAM is free) if the php script is creating thumbnails for three 60kb pictures. Not usable even for a small wordpress instance. The support is fine but is not changing any settings.
The links from UK are quite fine:
Download speed from CacheFly: 5.97MB/s
Download speed from Linode, Atlanta GA: 2.45MB/s
Download speed from Linode, Dallas, TX: 2.58MB/s
Download speed from Linode, Tokyo, JP: 1.30MB/s
Download speed from Linode, London, UK: 5.57MB/s
Download speed from Leaseweb, Haarlem, NL: 6.91MB/s
Download speed from Softlayer, Singapore: 1.70MB/s
Download speed from Softlayer, Seattle, WA: 2.59MB/s
Download speed from Softlayer, San Jose, CA: 242KB/s
Download speed from Softlayer, Washington, DC: 4.80MB/s
Quite the oppsite is VPSCheap.net. Not that I/O speed but solid with TUN/TAP even PPP is working. Support is as responsive as Edis but is changing settings and tries to find a solution.
So basically I am paying for Kernelmodules and a stable environment. I don't want to save up to 1$ per month to lose that.