Re: [Xen-users] XCP with 64-bit dom0?

[George Shuklin <george.shuklin@xxxxxxxxx>]

Actually I know at least one reason to have 64-bits dom0: speed of 
network/disk operations. I test a pretty fast raid60 with about 50 disks 
in it connected via iscsi (over 10G) and found 64-bit OS (same config, 
same version) have about 5% gain in speed (about 1.15GB/s against 
1.1GB/s for 32-bit)
And I expect some speedup for openvswitch/netback (which one is 
bottleneck right now...)
On 21.04.2011 09:07, Dustin Marquess wrote:
> On Wed, Apr 20, 2011 at 2:08 PM, Kannan Vijayan<kvijayan@xxxxxxxxxxxxxx>  wrote:
> > Hi all,
> >
> > For the last couple weeks or so, I've been pounding away at building a
> > version of the XCP host tools to run on a 64-bit dom0 (not just a
> > 64-bit kernel, but a full 64-bit tool stack).  I'm starting with the
> > basic build setup of Centos 5.5 with arch x86_64.  Naturally, I'm
> > rebuilding a large number of RPM packages from source, and I'm running
> > into package hell as I try to track down proper 64-bit source versions
> > of packages, fix build and compile issues, and get up to the point of
> > being able to build the xapi-libs and xapi packages.
> I've never tried it.  Is there a particular reason WHY you want to do
> it?  I can't think of any benefit, and the downside is your dom0 will
> use more RAM, which means less RAM available for your domUs.
>
> -Dustin
>
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