[Beowulf] i7-4770R 128MB L4 cache CPU in compact 0.79 litre box - DIY cluster?

Christopher Samuel samuel at unimelb.edu.au
Mon Jan 20 19:57:56 PST 2014


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On 21/01/14 09:49, Mark Hahn wrote:

> I'm not really sure why the kernel would need to do anything...

Wikipedia says (*cough*):

http://en.wikipedia.org/wiki/HD_Graphics_4000

# The 128 MB of eDRAM is on the same package as the CPU, but in a
# separate die manufactured in a different process. Intel refers
# to this as a Level 4 cache that is available to both CPU and GPU,
# naming it Crystal Well. Linux support for this eDRAM is expected
# in kernel version 3.12, by making the drm/i915 driver aware and
# capable of using it.

The kernel code seems to refer to this eDRAM as eLLC or LLC FWIW, but
there's been code coming in for this for a while now, perhaps that was
just supporting infrastructure that wasn't enabled in the i915 driver
until 3.12?

For more info see "git log -p drivers/gpu/drm/i915/" :-)

cheers!
Chris
- -- 
 Christopher Samuel        Senior Systems Administrator
 VLSCI - Victorian Life Sciences Computation Initiative
 Email: samuel at unimelb.edu.au Phone: +61 (0)3 903 55545
 http://www.vlsci.org.au/      http://twitter.com/vlsci

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