Linux Patches Confirm Intel Meteor Lake Having An L4 Cache

Written by Michael Larabel in Intel on 12 April 2023 at 05:55 AM EDT. 9 Comments
A new Intel graphics kernel driver patch posted by Intel on Tuesday confirm that upcoming Meteor Lake processors will feature an ADM/L4 cache.

The patch entitled drm/i915/mtl: Define MOCS and PAT tables for MTL makes mention:
"On MTL, GT can no longer allocate on LLC - only the CPU can. This, along with addition of support for ADM/L4 cache calls a MOCS/PAT table update."

Adding this L4 cache to Meteor lake is interesting and with few details publicly revealed thus far. There previously were rumors around stacked cache and extra cache appearing on other tiles for Meteor Lake.

Intel Meteor Lake L4 cache confirmation

Presumably this new L4 cache will be akin to the eDRAM found with older Broadwell processors like the Core i7 5775C.

In any event, confirmation of one more reason to get excited about Meteor Lake and its changes. With the timing of the new Intel Meteor Lake enablement patches for the i915 kernel graphics driver, this latest feature work won't be mainlined until the Linux 6.5 kernel cycle later this summer.
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