Changing clock division ratio to 6 from 2 we get these figures: We expect this to be 3 times slower. root@linaro-nano:/home/djg11/UnixBench# devmem2 0xF8000120 w /dev/mem opened. Memory mapped at address 0xb6fb5000. Value at address 0xF8000120 (0xb6fb5120): 0x1F000600 make[1]: Entering directory `/home/djg11/UnixBench' Checking distribution of files ./pgms exists ./src exists ./testdir exists ./tmp exists ./results exists make[1]: Leaving directory `/home/djg11/UnixBench' locale: Cannot set LC_CTYPE to default locale: No such file or directory locale: Cannot set LC_MESSAGES to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory locale: Cannot set LC_CTYPE to default locale: No such file or directory locale: Cannot set LC_MESSAGES to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory sh: 3dinfo: command not found # # # # # # # ##### ###### # # #### # # # # ## # # # # # # # ## # # # # # # # # # # # ## ##### ##### # # # # ###### # # # # # # ## # # # # # # # # # # # # ## # # # # # # # ## # # # # #### # # # # # ##### ###### # # #### # # Version 5.1.3 Based on the Byte Magazine Unix Benchmark Multi-CPU version Version 5 revisions by Ian Smith, Sunnyvale, CA, USA January 13, 2011 johantheghost at yahoo period com Use of uninitialized value in printf at ./Run line 1378. Use of uninitialized value in printf at ./Run line 1380. Use of uninitialized value in printf at ./Run line 1378. Use of uninitialized value in printf at ./Run line 1380. Use of uninitialized value in printf at ./Run line 1588. Use of uninitialized value in printf at ./Run line 1590. Use of uninitialized value in printf at ./Run line 1588. Use of uninitialized value in printf at ./Run line 1590. 1 x Dhrystone 2 using register variables 1 2 3 4 5 6 7 8 9 10 1 x Double-Precision Whetstone 1 2 3 4 5 6 7 8 9 10 1 x Execl Throughput 1 2 3 1 x File Copy 1024 bufsize 2000 maxblocks 1 2 3 1 x File Copy 256 bufsize 500 maxblocks 1 2 3 1 x File Copy 4096 bufsize 8000 maxblocks 1 2 3 1 x Pipe Throughput 1 2 3 4 5 6 7 8 9 10 1 x Pipe-based Context Switching 1 2 3 4 5 6 7 8 9 10 1 x Process Creation 1 2 3 1 x System Call Overhead 1 2 3 4 5 6 7 8 9 10 1 x Shell Scripts (1 concurrent) 1 2 3 1 x Shell Scripts (8 concurrent) 1 2 3 2 x Dhrystone 2 using register variables 1 2 3 4 5 6 7 8 9 10 2 x Double-Precision Whetstone 1 2 3 4 5 6 7 8 9 10 2 x Execl Throughput 1 2 3 2 x File Copy 1024 bufsize 2000 maxblocks 1 2 3 2 x File Copy 256 bufsize 500 maxblocks 1 2 3 2 x File Copy 4096 bufsize 8000 maxblocks 1 2 3 2 x Pipe Throughput 1 2 3 4 5 6 7 8 9 10 2 x Pipe-based Context Switching 1 2 3 4 5 6 7 8 9 10 2 x Process Creation 1 2 3 2 x Pipe-based Context Switching 1 2 3 4 5 6 7 8 9 10 2 x Process Creation 1 2 3 2 x System Call Overhead 1 2 3 4 5 6 7 8 9 10 2 x Shell Scripts (1 concurrent) 1 2 3 2 x Shell Scripts (8 concurrent) 1 2 3 ======================================================================== BYTE UNIX Benchmarks (Version 5.1.3) System: linaro-nano: GNU/Linux OS: GNU/Linux -- 3.12.0-g7903644 -- #1 SMP PREEMPT Fri May 30 11:25:50 EDT 2014 Machine: armv7l (armv7l) Language: en_US.utf8 (charmap="ANSI_X3.4-1968", collate="ANSI_X3.4-1968") CPU 0: ARMv7 Processor rev 0 (v7l) (0.0 bogomips) CPU 1: ARMv7 Processor rev 0 (v7l) (0.0 bogomips) 10:56:11 up 31 min, 2 users, load average: 2.59, 3.27, 1.87; runlevel 2 ------------------------------------------------------------------------ Benchmark Run: Wed Mar 04 2015 10:56:11 - 11:24:31 2 CPUs in system; running 1 parallel copy of tests Dhrystone 2 using register variables 2405913.2 lps (10.0 s, 7 samples) Double-Precision Whetstone 400.2 MWIPS (10.0 s, 7 samples) Execl Throughput 238.9 lps (29.9 s, 2 samples) File Copy 1024 bufsize 2000 maxblocks 25046.4 KBps (30.0 s, 2 samples) File Copy 256 bufsize 500 maxblocks 6815.4 KBps (30.0 s, 2 samples) File Copy 4096 bufsize 8000 maxblocks 83403.7 KBps (30.0 s, 2 samples) Pipe Throughput 56009.8 lps (10.0 s, 7 samples) Pipe-based Context Switching 12777.4 lps (10.0 s, 7 samples) Process Creation 746.2 lps (30.0 s, 2 samples) Shell Scripts (1 concurrent) 631.2 lpm (60.1 s, 2 samples) Shell Scripts (8 concurrent) 115.2 lpm (60.4 s, 2 samples) System Call Overhead 95794.6 lps (10.0 s, 7 samples) System Benchmarks Index Values BASELINE RESULT INDEX Dhrystone 2 using register variables 116700.0 2405913.2 206.2 Double-Precision Whetstone 55.0 400.2 72.8 Execl Throughput 43.0 238.9 55.6 File Copy 1024 bufsize 2000 maxblocks 3960.0 25046.4 63.2 File Copy 256 bufsize 500 maxblocks 1655.0 6815.4 41.2 File Copy 4096 bufsize 8000 maxblocks 5800.0 83403.7 143.8 Pipe Throughput 12440.0 56009.8 45.0 Pipe-based Context Switching 4000.0 12777.4 31.9 Process Creation 126.0 746.2 59.2 Shell Scripts (1 concurrent) 42.4 631.2 148.9 Shell Scripts (8 concurrent) 6.0 115.2 192.0 System Call Overhead 15000.0 95794.6 63.9 ======== System Benchmarks Index Score 77.7 ------------------------------------------------------------------------ Benchmark Run: Wed Mar 04 2015 11:24:31 - 11:52:52 2 CPUs in system; running 2 parallel copies of tests Dhrystone 2 using register variables 4790903.1 lps (10.0 s, 7 samples) Double-Precision Whetstone 798.6 MWIPS (10.0 s, 7 samples) Execl Throughput 438.5 lps (29.9 s, 2 samples) File Copy 1024 bufsize 2000 maxblocks 20739.5 KBps (30.0 s, 2 samples) File Copy 256 bufsize 500 maxblocks 5417.9 KBps (30.0 s, 2 samples) File Copy 4096 bufsize 8000 maxblocks 72636.2 KBps (30.0 s, 2 samples) Pipe Throughput 114636.7 lps (10.0 s, 7 samples) Pipe-based Context Switching 25071.4 lps (10.0 s, 7 samples) Process Creation 1265.9 lps (30.0 s, 2 samples) Shell Scripts (1 concurrent) 843.1 lpm (60.1 s, 2 samples) Shell Scripts (8 concurrent) 116.7 lpm (60.4 s, 2 samples) System Call Overhead 186921.9 lps (10.0 s, 7 samples) System Benchmarks Index Values BASELINE RESULT INDEX Dhrystone 2 using register variables 116700.0 4790903.1 410.5 Double-Precision Whetstone 55.0 798.6 145.2 Execl Throughput 43.0 438.5 102.0 File Copy 1024 bufsize 2000 maxblocks 3960.0 20739.5 52.4 File Copy 256 bufsize 500 maxblocks 1655.0 5417.9 32.7 File Copy 4096 bufsize 8000 maxblocks 5800.0 72636.2 125.2 Pipe Throughput 12440.0 114636.7 92.2 Pipe-based Context Switching 4000.0 25071.4 62.7 Process Creation 126.0 1265.9 100.5 Shell Scripts (1 concurrent) 42.4 843.1 198.8 Shell Scripts (8 concurrent) 6.0 116.7 194.5 System Call Overhead 15000.0 186921.9 124.6 ======== System Benchmarks Index Score 111.4 real 56m41.823s user 16m58.060s sys 38m6.820s