Software Environments - Heterogeneous Multicore Processor Technologies for Embedded Systems - page 154

Table 5.3 Software version

Software Version number

Linux 2.6.16

glibc 2.3.3

Table 5.4 Process-related performance

Performance
ratio (%) TAS (us) LL/SC (us)

Null call 0.44 0.44 100

Null I/O 0.83 0.83 100

Stat 12.20 8.69 140

Open/close 16.4 11.6 141

Select TCP 59.3 42.4 140

Sig inst 1.91 1.81 106

Sig handle 92.1 84.8 109

Fork proc 3,932 3,578 110

Exec proc 10,801 9,981 108

Shell proc 32 k 30 k 107

Table 5.5 Inter-process communication performance

Performance
ratio (%) TAS (us) LL/SC (us)

Pipe 17.5 14.3 122

AF UNIX 42 36.3 116

UDP 62.8 60.6 104

TCP 115 88.4 130

TCP conn 289 241 120

Table 5.6 File system and virtual memory related performance

Performance
ratio (%) TAS (us) LL/SC (us)

0 K fi le create 57.6 41.8 138

0 K fi le delete 32.6 24.4 134

10 K fi le create 281.3 238.5 118

10 K fi le delete 75.1 52.7 143

Mmap Latency 4,904 4,418 111

Page Fault 50 45.3 110

100fds select 39.5 25.1 157

The results are presented in Table 5.4 - 5.6 .
We can summarize that the SMP Linux using LL/SC atomic operation achieves
better performance than the SMP Linux using TAS atomic operation in all of the
LMBench results.