WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

RE: [Xen-users] System seams slower with Xenified kernel and xend dies w

To: "Gabriel Rossetti" <rossettigab@xxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] System seams slower with Xenified kernel and xend dies with SIG 15
From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
Date: Wed, 2 Aug 2006 12:08:51 +0200
Delivery-date: Wed, 02 Aug 2006 03:10:53 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <44D0767F.9090905@xxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: Aca2GdxTYP/+ErY/TNiDd2kdDBtuBAAAVsMA
Thread-topic: [Xen-users] System seams slower with Xenified kernel and xend dies with SIG 15
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Gabriel Rossetti
> Sent: 02 August 2006 10:55
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] System seams slower with Xenified 
> kernel and xend dies with SIG 15
> 
> Ok, but wouldn't the OS take care of that? I don't think that 
> the driver
> does any
> address translations, it would make no sense, it would use virtual
> addresses and the OS, in my case a Xenified
> linux kernel, takes care of translations. I suspect that some of the
> changes made for Xen is the memory management, no?

Yes, but some of the changes in the Xenified kernel is to add/change the
code in drivers... And since the binary for the ATI (or nVidia) drivers
aren't source-code, they don't get the new code by recompiling the
kernel... 

> If so then I would make sense that it stays transparent so that
> everything would still work and
> not have to recompile everything like in Denali. At least 
> that's what I
> think, from what I saw in
> an OS class, and that I had to implement an OS's memory 
> managment, but I
> may be wrong. Also,
> my binary Intel ipw3945 wireless drivers work fine, so I don't think
> that is it, but then again, I may
> be wrong. From my light investigation I think it's a path problem, it
> can't find something apparently,
> and I don't get why not. I'll have to look at it more when I 
> find the time.

Maybe the wireless driver is more "well-behaved". 

--
Mats
> 
> Gabriel
> 
> 
> 
> Petersson, Mats wrote:
> >
> > Can't comment on xend dieing, but any binary driver would 
> be unlikely to
> > work in Xenified kernel, since the Xenified kernel changes 
> some of the
> > things that a driver needs to do when it translates memory addresses
> > from virtual to physical - there are now two different 
> types of physical
> > address: pseudo-physical, which is what the OS sees, and machine
> > physical, which is what the PROCESSOR sees. If you have a 
> Dom0 that has
> > 512MB of RAM, it will not necessarily have all it's memory from
> > 0..512MB, but it may actually be located anywhere Xen likes 
> it to be...
> > [Dom0 is most likely starting somewhere low, since it's 
> loaded early -
> > but that's just luck, rather than planned for]. Machine physical is
> > needed for the PCI (PCIe == PCIx == AGP == PCI in this case 
> - they are
> > just different hardware implementations of the same 
> protocol) so that
> > the card can access memory directly, and for sure all 
> modern graphics
> > cards have direct memory access capabilities (and most 
> likely doesn't do
> > much other than a standard 15 year old VGA card if you 
> don't use these
> > capability). 
> >
> >
> > --
> > Mats
> >
> >
> >   
> 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
> 
> 
> 



_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users