Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Highlighted
Beginner
41 Views

Estimate L1, L2 cache size of Knights Landing in photo die

Hello all,

I'm writing to know how to estimate or calculate L1, L2 cache size of Knights Landing in photo die

Below is the information about Knights Landing,

Die size: 683mm^2 (31.9mm x 21.4mm)
Silicon size: 14nm
Transistor: 8 billion

Is there any equation to estimate L1, L2 cache size with information? 

Thank you.

0 Kudos
4 Replies
Highlighted
New Contributor III
41 Views

just look up the specs on ark.intel.com ...

L1: 16 K

L2: 1 MB per core

L3: 32 MB for a 64 core machine, 34 MB  for a 68 core machine, 36 MB for a 72 core machine

Each core has 4 threads.

 

0 Kudos
Highlighted
Beginner
41 Views

I do not think KNL has L3 cache.

L1: 32K

L2:1MB shared by 2 cores.

More info can be found from the paper KNIGHTS LANDING: SECONDGENERATION INTEL XEON PHI PRODUCT (https://www.computer.org/cms/Computer.org/ComputingNow/issues/2016/06/mmi2016020034.pdf)

0 Kudos
Highlighted
New Contributor III
41 Views

Whoops, I stand corrected: you are absolutely right.

You could consider the MCDRAM to be a L3 cache, but the MCDRAM is not low-latency memory...

 

0 Kudos
Highlighted
Beginner
41 Views

Ops, I think my writing has confused you.

I want to know 'real' cache size (e.g. mm^2) in photo die.
So, I've written information about die size, silicon size and number of transistor of KNL.
In other words, I want to calculate the portion of real L1, L2 size in photo die(683mm^2)

If you know about this information, please let me know.

0 Kudos