By: Michael S (already5chosen.delete@this.yahoo.com), December 21, 2017 1:52 am
Room: Moderated Discussions
Micahel S (already5chosen.delete@this.yahoo.com) on December 20, 2017 2:53 pm wrote:
> Bridges? Wells?
Yes, Bridges and Wells show the same behavior.
13.5 cycles per iteration on Ivy Bridge (i7-3770)
14 cycles per iteration on Haswell (E3-1271 v3)
So my first thought (associativity conflict, due to SKL L2 having fewer ways than L1D) proves wrong.
However I still think that for some reason approximately 30-50% of the stores that shell be going to L2 end up in main memory and most of the rest goes to LLC.
Unlike me, you like to read performance counters. What do they say?
> Bridges? Wells?
Yes, Bridges and Wells show the same behavior.
13.5 cycles per iteration on Ivy Bridge (i7-3770)
14 cycles per iteration on Haswell (E3-1271 v3)
So my first thought (associativity conflict, due to SKL L2 having fewer ways than L1D) proves wrong.
However I still think that for some reason approximately 30-50% of the stores that shell be going to L2 end up in main memory and most of the rest goes to LLC.
Unlike me, you like to read performance counters. What do they say?