This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:
apport-collect 1585850
and then change the status of the bug to 'Confirmed'.
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1585850
Title:
[Bug]KNL:Spread MWAIT cache lines over all nodes
Status in intel:
New
Status in linux package in Ubuntu:
Incomplete
Bug description:
KNL sees severely degraded memory bandwidth on MCDRAM with C-states deeper
than C1 and with sub numa clustering enabled. This has been root caused to all
idle task's MWAIT cache line placed in node 0. Node 0's CHA goes into degraded
mode because the many MWAIT lines overflow an internal hash table.
Fix is to allocate the idle task's task structs on their respective nodes.
The fix patch is merged into linux-next and will be part of v4.7,
please back port into 16.04 kernel:
725fc62 kernek/fork.c: allocate idle task for a CPU always on its
local node
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