[Fedora-xen] Follow up to "No agpgart? What?"

[Rick Stevens]

On Wed, 2007-10-17 at 07:41 +0100, Richard W.M. Jones wrote:
> Rick Stevens wrote:
> > (EE) GARTInit: Unable to open /dev/agpgart (No such file or directory)
> > (WW) intel(0): /dev/agpgart is either not available, or no memory is
> > available
> > for allocation.  Using pre-allocated memory only.
> > (==) intel(0): VideoRam: 7676 KB
> > (EE) intel(0): [dri] I830CheckDRIAvailable failed: glx not loaded
> > (II) intel(0): Allocating 255 scanlines for pixmap cache
> > (EE) intel(0): Failed to allocate framebuffer. Is your VideoRAM set too
> > low?
> > (EE) intel(0): Couldn't allocate video memory
> 
> Are you starting X immediately after booting, or some time later?

Standard time.  All I did was boot the xen0 kernel instead of the
standard one.  It works on every other machine I have, just not this
one.

> I don't think the agpgart message is relevant.  What I think is 
> happening is that the driver cannot allocate enough videoram, or perhaps 
> cannot allocate it contiguously in physical RAM or something along those 
> lines.

I think it is.  The standard kernel does fire up /dev/agpgart and it
does allocate memory:

(II) intel(0): Kernel reported 488960 total, 1 used
(II) intel(0): I830CheckAvailableMemory: 1955836 kB available
(==) intel(0): VideoRam: 262144 KB  <<<<-----NOTE!
(EE) intel(0): [dri] I830CheckDRIAvailable failed: glx not loaded
(II) intel(0): Allocating 5472 scanlines for pixmap cache
(II) intel(0): Memory allocation layout:
(II) intel(0): 0x00000000-0x0001ffff: ring buffer (128 kB)
(II) intel(0): 0x00020000-0x00029fff: HW cursors (40 kB)
(II) intel(0): 0x0002a000-0x00031fff: logical 3D context (32 kB)
(II) intel(0): 0x00032000-0x00041fff: exa G965 state buffer (64 kB)
(II) intel(0): 0x00050000-0x02147fff: front buffer (33760 kB)
(II) intel(0): 0x0077f000:            end of stolen memory
(II) intel(0): 0x02148000-0x02157fff: xaa scratch (64 kB)
(II) intel(0): 0x10000000:            end of aperture

Same xorg.conf file.

> In any case you should read the i810 manpage (`man i810') and see if any 
> of the many tips / configuration settings in that page makes any 
> difference at all.  (Particularly play with increasing or decreasing 
> VideoRam, and disabling DRI).

I'll do that, but under the standard kernel it allocates video RAM just
fine.  It doesn't under the xen0 kernel.

UPDATE:  Just tried it.  I did screw up and just say "256" rather than
"256MB".  /dev/agpgart still doesn't exist.  The only change I see is a
warning in the log:

(WW) intel(0): VideoRam configuration found, which is no longer
recommended.
(II) intel(0): Continuing with default 262144kB VideoRam instead of 256
kB.

The 262144kB bit is the same as under the regular kernel but /dev/agpart
still doesn't exist.  This is more and more a Xen kernel issue.

> If that doesn't help then it's probably a general Xen problem, so asking 
> about this upstream on xen-users[1] or xen-devel[2] lists could help.

Yeah, I'm thinking about that.

> In any case, if you find a way to fix it please let us know.

I'll keep you posted.

Side note to Rich...it'd be nice if the list was in your To: as opposed
to being in the Cc:.  That's why I posted directly to you last time...
I tend to use "Reply" not "Reply All".

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- Rick Stevens, Principal Engineer             rstevens at internap.com -
- CDN Systems, Internap, Inc.                http://www.internap.com -
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-           Lottery: A tax on people who are bad at math.            -
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