Re: [Xen-devel] Custom build the Xen0 kernel && miscellany

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

The Makefile pulls your config files from install/boot/config-*.
It is fine to modify the configurations as neceesary. Note that SMP
isn't available for guest OSes -- Xen currently only supports
uniprocessor guests, even though it itself is SMP capable.

 -- Keir

> Hi everyone,
> 
> I'm new to the list. I'm a systems admin at a multimedia company in New 
> Zealand. I'm currently constructing a small cluster of dual Xeon machines 
> which will host web sites in Xen VMs.
> 
> I would like to stick with the 'best practices' of the Xen project in terms 
> of 
> managing the kernel source trees and builds, but I find that the default 
> build contains a bit more than I would like, and not everything I would need. 
> For example, I our cluster machines have RageXL graphics adapters, and 
> therefore I would like to compile in framebuffer support so I can run X. Not 
> critical, no, but I prefer it especially during my investigations.
> 
> I am using the Xen 2.0 bk builds, and the host OS is Debian Sarge. Both seem 
> to be close to stable releases and so hopefully my timing is going to be 
> fairly good!
> 
> Can I tell the default build system to use a modified .config file for the 
> kernel build? From the looks of the makefile it appears that much more than 
> patching and compiling is going on with the kernel, so if I do a make 
> menuconfig and make my changes, am I able to install the kernel in the normal 
> way?
> 
> The support I'm adding is for SMP, hypterthreading, big memory, and ATI 
> framebuffer support. I'd also like to pull out various bits and pieces -- 
> mostly drivers for hardware I don't have, as this would speed up the build 
> process.
> 
> Thank you for your time. I've been watching Xen with some interest for a 
> while 
> now and I'm thrilled that my employer has given me the go ahead to put 
> together this cluster. I would like to feed the results back to the Xen 
> project somewhere, especially where it pertains to performance of virtual web 
> and database servers. It seems that the wiki has gone west (been dead for a 
> while now), so perhaps it would be appropriate for me to submit stuff back to 
> this list for archival purposes.
> 
> (Speaking of the email archive, could it be modified for searching? I'm sure 
> my questions have been asked before)
> 
> One final question (and this is bound to be unpopular). I would like to have 
> some idea as to how many virtual web servers I might be able to run on dual 
> Xeon 2.8GHz machines with 4-12GB RAM. Our sites are typically LAMP, with 
> medium sized databases. On average, our current web servers are 900MHz PIII 
> machines that don't often get pushed very hard. Perhaps just some anecdotal 
> accounts would satisfy my curiosity. I realize I'm not being too practical 
> here -- my apologies! ;o).
> 
> Thanks all for your time. 
> 
> Regards,
> Paul Dorman
> Systems Administrator
> CWA New Media Ltd.
> 
> 
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