Hi all,
We have similar servers, and I use xen 3.2.1 (3.3.0 seems to be too
buggy). The hypervisor is 64bit, but all domains (including dom0) are
32bit PAE, because a 64bit dom0 - for example - can't migrate a 32bit
domU, but a 32bit domU can migrate a 64bit domU, AFAIK. So, accordint to
my experiences, 32bit PAE domains (with the original xen.org kernels, if
you can afford it) running on a 64bit hypervisor seem to be the best
soulution to utilize a beast like your machine. Xen 3.2.1 seems to be
fast, and reliable.
I compiled xen the following way:
I downloaded the linux-2.6.18-xen-3.2.0 kernel and xen-3.2.1 separately,
and then first, i compiled the kernel by:
gzip -dc /proc/config.gz
make menuconfig
<SOME CONFIGURATION, especially don't forget to set "Processor type and
features" -> "High Memory Support" to 64GB in order to make it a PAE
kernel>
make
<During the building process, i watch this video:
http://www.youtube.com/watch?v=PLyTrsk1Ey8>
make install
make modules_install
mkinitrd <IN SOME WAY>
After compiling and installing the kernel, I compiled and installed xen,
but I didn't do a "make world" at all!! I did it the following way:
On a 64 bit machine, or by cross-compiling (i've personally never
tried), I build the hypervisor:
make xen #this creates only the hypervisor (/boot/xen-3.3.0.gz)
make install-xen
After installing, I copy the hypervisor (/boot/xen-3.2.1.gz) to the
32bit target dom0.
And finally I compile and install the tools on the (32bit, of course)
dom0:
make tools #this creates thigs like the xm command, hvm environment,
#network scripts, etc.
make install-tools
Best regards,
Tamas
2008. 09. 25, csütörtök keltezéssel 11.22-kor Geoffrey ezt írta:
> We have some fairly robust hardware we are trying to set up a number of
> para-virtual servers in a clustered environment and we are seeing huge
> cpu issues. Specs:
>
> Dell 1950: 8 1u servers
> cpu MHz : 2660.038
> dual quad cores
> 32G memory each
>
> Our first virual server was configured to use 8G and 4 cores.
>
> I tried running a quick test by compiling our application, simply
> running 'time make.' The results were terrible:
>
> real 0m56.79s
> user 0m26.53s
> sys 0m35.46s
>
> In comparison, my laptop (Intel Core2 Duo CPU @ 2.50GHz, 2G mem):
>
> real 0m42.99s
> user 0m29.85s
> sys 0m6.47s
>
> We then reconfigured the virtual server to use a single core and the
> results were almost identical to the 4 core test.
>
> Any insights as to what our problem might be would be greatly appreciated.
>
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