Hi Eric,<br><br><div class="gmail_quote">On Wed, Jun 8, 2011 at 4:33 PM, Eric Shubert <span dir="ltr"><<a href="mailto:ejs@shubes.net">ejs@shubes.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Is your goal absolute best performance (why?), or simply adequate<br>
performance?<br></blockquote><div><br>The hardware available to us is quite old, so pushing performance is absolutely the key issue. Stability/reliability and ease of maintenance are of course also factors. But since I've not have any bad experiences with OpenVZ in those respects, and I expect Xen to be at least as good, it pretty much comes down to performance.<br>
</div><div> </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
I wouldn't expect to see Xen outperform OpenVZ. However, if your CPU has<br>
has virtualization extensions, I would expect performance to be pretty<br>
close between the two.<br></blockquote><div><br>Unfortunately it doesn't. We're doing a "parallell shift" from a host with 2xOpteron 250 (2.4GHz) to another host with 8xOpteron 880 (also 2.4GHz but dual-core), so apart from the increase in number of cores from 2 to 16 and amount of RAM from 6 to 32GB there's no real difference to be found. But since we're transitioning anyway, we're giving alternative technology a consideration.<br>
<br>But okay, are you saying that Xen will at best be as good as OpenVZ using this hardware, and there's really not much point in me spending time learning Xen and running performance tests? That would save me quite a few workdays :)<br>
<br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">That being said, if you're considering Xen, I'd give strong<br>
consideration to KVM as well. <br></blockquote><div><br>Thanks, I already looked at KVM, but it seems to require the virtualization bit, which means it is not an option for us.<br><br>Thanks for your input, Eric, it is much appreciated :)<br>
<br>Cheers,<br>Einar<br></div></div>