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Altera_Forum
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8 years ago

Kernel performance with profiling

Hello again guys. Im struggle to understand the results from the profiler of two kernel versions (one with unroll factor of 128 and another with 32) The 32 unroll factor outperforms the 12...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

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Since the maximum read/write size per kernel clock cycle per DDR3/4 memory bank is 512-bits (standard value hardcoded in the BSP), for a total of 1024 bits for two banks, I have so far assumed that a burst size of 16 equals a read/write size of 1024 bits, hence the unit being 32-bit words. I could be wrong, though.

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Thats seems logic :) Last question (for now i guess), im using the board de5_net (http://www.terasic.com.tw/cgi-bin/page/archive.pl?language=english&categoryno=158&no=526&partno=2)

However, when i go to the BSP board spec, it says that i only have 2 GB for each bank (im assuming each dimm socket its a bank).. My question is, my frequency memory clock for DDR3 its 933 MHz?