2.2. Linux 09.01.00 Performance Guide¶
Read This First
All performance numbers provided in this document are gathered using following Evaluation Modules unless otherwise specified.
Name |
Description |
---|---|
AM335x EVM |
AM335x Evaluation Module rev 1.5B with ARM running at 1000MHz, DDR3-400 (400MHz/800 MT/S), TMDXEVM3358 |
Table: Evaluation Modules
About This Manual
This document provides performance data for each of the device drivers which are part of the Processor SDK Linux package. This document should be used in conjunction with release notes and user guides provided with the Processor SDK Linux package for information on specific issues present with drivers included in a particular release.
If You Need Assistance
For further information or to report any problems, contact http://e2e.ti.com/ or http://support.ti.com/
2.2.1. System Benchmarks¶
2.2.1.1. LMBench¶
LMBench is a collection of microbenchmarks of which the memory bandwidth and latency related ones are typically used to estimate processor memory system performance. More information about lmbench at http://lmbench.sourceforge.net/whatis_lmbench.html and http://lmbench.sourceforge.net/man/lmbench.8.html
Latency: lat_mem_rd-stride128-szN, where N is equal to or smaller than the cache size at given level measures the cache miss penalty. N that is at least double the size of last level cache is the latency to external memory.
Bandwidth: bw_mem_bcopy-N, where N is equal to or smaller than the cache size at a given level measures the achievable memory bandwidth from software doing a memcpy() type operation. Typical use is for external memory bandwidth calculation. The bandwidth is calculated as byte read and written counts as 1 which should be roughly half of STREAM copy result.
Execute the LMBench with the following:
cd /opt/ltp
./runltp -P j721e-idk-gw -f ddt/lmbench -s LMBENCH_L_PERF_0001
Benchmarks |
am335x-evm: perf |
---|---|
af_unix_sock_stream_latency (microsec) |
40.96 |
af_unix_socket_stream_bandwidth (MBs) |
186.32 |
bw_file_rd-io-1mb (MB/s) |
157.62 |
bw_file_rd-o2c-1mb (MB/s) |
147.34 |
bw_mem-bcopy-16mb (MB/s) |
203.35 |
bw_mem-bcopy-1mb (MB/s) |
205.80 |
bw_mem-bcopy-2mb (MB/s) |
206.70 |
bw_mem-bcopy-4mb (MB/s) |
200.71 |
bw_mem-bcopy-8mb (MB/s) |
193.36 |
bw_mem-bzero-16mb (MB/s) |
996.33 |
bw_mem-bzero-1mb (MB/s) |
595.43 (min 205.80, max 985.06) |
bw_mem-bzero-2mb (MB/s) |
595.40 (min 206.70, max 984.09) |
bw_mem-bzero-4mb (MB/s) |
592.30 (min 200.71, max 983.89) |
bw_mem-bzero-8mb (MB/s) |
588.81 (min 193.36, max 984.25) |
bw_mem-cp-16mb (MB/s) |
193.71 |
bw_mem-cp-1mb (MB/s) |
582.73 (min 182.98, max 982.48) |
bw_mem-cp-2mb (MB/s) |
589.61 (min 195.12, max 984.09) |
bw_mem-cp-4mb (MB/s) |
598.18 (min 192.08, max 1004.27) |
bw_mem-cp-8mb (MB/s) |
587.30 (min 185.47, max 989.12) |
bw_mem-fcp-16mb (MB/s) |
184.96 |
bw_mem-fcp-1mb (MB/s) |
588.96 (min 192.86, max 985.06) |
bw_mem-fcp-2mb (MB/s) |
586.05 (min 188.01, max 984.09) |
bw_mem-fcp-4mb (MB/s) |
584.21 (min 184.53, max 983.89) |
bw_mem-fcp-8mb (MB/s) |
581.35 (min 178.44, max 984.25) |
bw_mem-frd-16mb (MB/s) |
250.22 |
bw_mem-frd-1mb (MB/s) |
230.66 (min 192.86, max 268.46) |
bw_mem-frd-2mb (MB/s) |
219.60 (min 188.01, max 251.19) |
bw_mem-frd-4mb (MB/s) |
217.29 (min 184.53, max 250.05) |
bw_mem-frd-8mb (MB/s) |
214.27 (min 178.44, max 250.09) |
bw_mem-fwr-16mb (MB/s) |
996.02 |
bw_mem-fwr-1mb (MB/s) |
625.47 (min 268.46, max 982.48) |
bw_mem-fwr-2mb (MB/s) |
617.64 (min 251.19, max 984.09) |
bw_mem-fwr-4mb (MB/s) |
627.16 (min 250.05, max 1004.27) |
bw_mem-fwr-8mb (MB/s) |
619.61 (min 250.09, max 989.12) |
bw_mem-rd-16mb (MB/s) |
252.78 |
bw_mem-rd-1mb (MB/s) |
627.70 (min 270.82, max 984.57) |
bw_mem-rd-2mb (MB/s) |
620.30 (min 255.04, max 985.55) |
bw_mem-rd-4mb (MB/s) |
628.24 (min 252.84, max 1003.64) |
bw_mem-rd-8mb (MB/s) |
628.84 (min 252.53, max 1005.15) |
bw_mem-rdwr-16mb (MB/s) |
204.39 |
bw_mem-rdwr-1mb (MB/s) |
195.46 (min 182.98, max 207.94) |
bw_mem-rdwr-2mb (MB/s) |
199.62 (min 195.12, max 204.12) |
bw_mem-rdwr-4mb (MB/s) |
198.43 (min 192.08, max 204.77) |
bw_mem-rdwr-8mb (MB/s) |
194.90 (min 185.47, max 204.32) |
bw_mem-wr-16mb (MB/s) |
996.02 |
bw_mem-wr-1mb (MB/s) |
596.26 (min 207.94, max 984.57) |
bw_mem-wr-2mb (MB/s) |
594.84 (min 204.12, max 985.55) |
bw_mem-wr-4mb (MB/s) |
604.21 (min 204.77, max 1003.64) |
bw_mem-wr-8mb (MB/s) |
604.74 (min 204.32, max 1005.15) |
bw_mmap_rd-mo-1mb (MB/s) |
253.55 |
bw_mmap_rd-o2c-1mb (MB/s) |
167.36 |
bw_pipe (MB/s) |
322.54 |
bw_unix (MB/s) |
186.32 |
lat_connect (us) |
85.15 |
lat_ctx-2-128k (us) |
28.67 |
lat_ctx-2-256k (us) |
5.36 |
lat_ctx-4-128k (us) |
34.51 |
lat_ctx-4-256k (us) |
0.00 |
lat_fs-0k (num_files) |
198.00 |
lat_fs-10k (num_files) |
74.00 |
lat_fs-1k (num_files) |
111.00 |
lat_fs-4k (num_files) |
101.00 |
lat_mem_rd-stride128-sz1000k (ns) |
220.85 |
lat_mem_rd-stride128-sz125k (ns) |
11.74 |
lat_mem_rd-stride128-sz250k (ns) |
62.97 |
lat_mem_rd-stride128-sz31k (ns) |
3.03 |
lat_mem_rd-stride128-sz50 (ns) |
3.00 |
lat_mem_rd-stride128-sz500k (ns) |
183.34 |
lat_mem_rd-stride128-sz62k (ns) |
8.87 |
lat_mmap-1m (us) |
117.00 |
lat_ops-double-add (ns) |
8.97 |
lat_ops-double-div (ns) |
57.32 |
lat_ops-double-mul (ns) |
11.08 |
lat_ops-float-add (ns) |
8.97 |
lat_ops-float-div (ns) |
33.20 |
lat_ops-float-mul (ns) |
10.06 |
lat_ops-int-add (ns) |
1.01 |
lat_ops-int-bit (ns) |
0.67 |
lat_ops-int-div (ns) |
72.83 |
lat_ops-int-mod (ns) |
25.49 |
lat_ops-int-mul (ns) |
6.64 |
lat_ops-int64-add (ns) |
1.06 |
lat_ops-int64-bit (ns) |
0.68 |
lat_ops-int64-div (ns) |
188.60 |
lat_ops-int64-mod (ns) |
52.12 |
lat_ops-int64-mul (ns) |
6.07 |
lat_pagefault (us) |
1.62 |
lat_pipe (us) |
41.00 |
lat_proc-exec (us) |
1521.00 |
lat_proc-fork (us) |
1191.40 |
lat_proc-proccall (us) |
0.02 |
lat_select (us) |
41.44 |
lat_sem (us) |
6.11 |
lat_sig-catch (us) |
8.24 |
lat_sig-install (us) |
1.33 |
lat_sig-prot (us) |
0.74 |
lat_syscall-fstat (us) |
4.55 |
lat_syscall-null (us) |
0.49 |
lat_syscall-open (us) |
316.11 |
lat_syscall-read (us) |
0.86 |
lat_syscall-stat (us) |
6.38 |
lat_syscall-write (us) |
0.67 |
lat_tcp (us) |
1.05 |
lat_unix (us) |
40.96 |
latency_for_0.50_mb_block_size (nanosec) |
183.34 |
latency_for_1.00_mb_block_size (nanosec) |
110.42 (min 0.00, max 220.85) |
pipe_bandwidth (MBs) |
322.54 |
pipe_latency (microsec) |
41.00 |
procedure_call (microsec) |
0.02 |
select_on_200_tcp_fds (microsec) |
41.44 |
semaphore_latency (microsec) |
6.11 |
signal_handler_latency (microsec) |
1.33 |
signal_handler_overhead (microsec) |
8.24 |
tcp_ip_connection_cost_to_localhost (microsec) |
85.15 |
tcp_latency_using_localhost (microsec) |
1.05 |
Table: LM Bench Metrics
2.2.1.2. Dhrystone¶
Dhrystone is a core only benchmark that runs from warm L1 caches in all modern processors. It scales linearly with clock speed. For standard ARM cores the DMIPS/MHz score will be identical with the same compiler and flags.
Execute the benchmark with the following:
runDhrystone
Benchmarks |
am335x-evm: perf |
---|---|
cpu_clock (MHz) |
1000.00 |
dhrystone_per_mhz (DMIPS/MHz) |
2.10 |
dhrystone_per_second (DhrystoneP) |
3773585.00 |
Table: Dhrystone Benchmark
2.2.1.3. Whetstone¶
Whetstone is a benchmark primarily measuring floating-point arithmetic performance.
Execute the benchmark with the following:
runWhetstone
Benchmarks |
am335x-evm: perf |
---|---|
whetstone (MIPS) |
833.30 |
Table: Whetstone Benchmark
2.2.1.4. Linpack¶
Linpack measures peak double precision (64 bit) floating point performance in solving a dense linear system.
Benchmarks |
am335x-evm: perf |
---|---|
linpack (Kflops) |
50419.00 |
Table: Linpack Benchmark
2.2.1.5. NBench¶
NBench which stands for Native Benchmark is used to measure macro benchmarks for commonly used operations such as sorting and analysis algorithms. More information about NBench at https://en.wikipedia.org/wiki/NBench and https://nbench.io/articles/index.html
Benchmarks |
am335x-evm: perf |
---|---|
assignment (Iterations) |
7.77 |
fourier (Iterations) |
2891.70 |
fp_emulation (Iterations) |
70.38 |
huffman (Iterations) |
727.35 |
idea (Iterations) |
1706.30 |
lu_decomposition (Iterations) |
76.53 |
neural_net (Iterations) |
2.21 |
numeric_sort (Iterations) |
418.37 |
string_sort (Iterations) |
67.17 |
Table: NBench Benchmarks
2.2.1.6. Stream¶
STREAM is a microbenchmark for measuring data memory system performance without any data reuse. It is designed to miss on caches and exercise data prefetcher and speculative accesses. It uses double precision floating point (64bit) but in most modern processors the memory access will be the bottleneck. The four individual scores are copy, scale as in multiply by constant, add two numbers, and triad for multiply accumulate. For bandwidth, a byte read counts as one and a byte written counts as one, resulting in a score that is double the bandwidth LMBench will show.
Execute the benchmark with the following:
stream_c
Benchmarks |
am335x-evm: perf |
---|---|
add (MB/s) |
528.70 |
copy (MB/s) |
486.60 |
scale (MB/s) |
614.30 |
triad (MB/s) |
445.60 |
Table: Stream
2.2.2. ALSA SoC Audio Driver¶
Access type - RW_INTERLEAVED
Channels - 2
Format - S16_LE
Period size - 64
Sampling Rate (Hz) |
am335x-evm: Throughput (bits/sec) |
am335x-evm: CPU Load (%) |
---|---|---|
8000 |
255998.00 |
2.27 |
11025 |
352796.00 |
2.61 |
16000 |
511995.00 |
3.75 |
22050 |
705594.00 |
4.14 |
24000 |
705592.00 |
3.44 |
32000 |
1023988.00 |
7.47 |
44100 |
1411183.00 |
5.03 |
48000 |
1535983.00 |
2.48 |
88200 |
2822364.00 |
7.95 |
96000 |
3071961.00 |
12.37 |
Table: Audio Capture
Sampling Rate (Hz) |
am335x-evm: Throughput (bits/sec) |
am335x-evm: CPU Load (%) |
---|---|---|
8000 |
256101.00 |
0.85 |
11025 |
352940.00 |
0.78 |
16000 |
512203.00 |
0.17 |
22050 |
705880.00 |
1.55 |
24000 |
705878.00 |
1.29 |
32000 |
1024404.00 |
0.29 |
44100 |
1411756.00 |
2.13 |
48000 |
1536606.00 |
4.54 |
88200 |
2823510.00 |
4.36 |
96000 |
3073208.00 |
0.77 |
Table: Audio Playback
2.2.3. NAND Driver¶
2.2.3.1. AM335X-EVM¶
Buffer size (bytes) |
am335x-evm: Write UBIFS Throughput (Mbytes/sec) |
am335x-evm: Write UBIFS CPU Load (%) |
am335x-evm: Read UBIFS Throughput (Mbytes/sec) |
am335x-evm: Read UBIFS CPU Load (%) |
---|---|---|---|---|
102400 |
3.45 (min 3.41, max 3.56) |
68.18 (min 67.31, max 68.65) |
6.32 |
32.26 |
262144 |
3.51 (min 3.47, max 3.58) |
65.30 (min 64.51, max 65.89) |
6.30 |
29.16 |
524288 |
3.42 (min 3.39, max 3.44) |
68.32 (min 67.94, max 69.29) |
6.33 |
29.78 |
1048576 |
3.41 (min 3.38, max 3.42) |
68.15 (min 67.20, max 68.90) |
6.34 |
29.78 |
5242880 |
3.42 (min 3.39, max 3.44) |
68.06 (min 66.88, max 69.18) |
6.34 |
28.61 |
2.2.4. USB Driver¶
2.2.4.1. USB Device Controller¶
Number of Blocks |
am335x-evm: Throughput (MB/sec) |
---|---|
150 |
18.00 |
Table: USBDEVICE HIGHSPEED SLAVE READ THROUGHPUT
Number of Blocks |
am335x-evm: Throughput (MB/sec) |
---|---|
150 |
7.60 |
Table: USBDEVICE HIGHSPEED SLAVE WRITE THROUGHPUT