Dear all,

75 usecs on standard Linux but only 19 usecs on XenLinux.

Any insight is highly appreciated.
Thanks.
Xuehai
XenLinux:
# strace -c /bin/sh -c /bin/echo foo
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
 39.05 0.001972 1972 1 write
 19.35 0.000977 977 1 execve
 7.74 0.000391 24 16 old_mmap
 7.23 0.000365 41 9 2 open
 6.06 0.000306 51 6 read
 5.17 0.000261 10 26 brk
 4.93 0.000249 83 3 munmap
 1.98 0.000100 14 7 close
 1.90 0.000096 9 11 rt_sigaction
 1.52 0.000077 11 7 fstat64
 1.01 0.000051 9 6 rt_sigprocmask
 0.95 0.000048 24 2 access
 0.81 0.000041 14 3 uname
 0.75 0.000038 19 2 stat64
 0.38 0.000019 19 1 ioctl
 0.18 0.000009 9 1 time
 0.18 0.000009 9 1 getppid
 0.16 0.000008 8 1 getpgrp
 0.16 0.000008 8 1 getuid32
 0.14 0.000007 7 1 getgid32
 0.12 0.000006 6 1 getpid
 0.12 0.000006 6 1 geteuid32
 0.12 0.000006 6 1 getegid32
------ ----------- ----------- --------- --------- ----------------
100.00 0.005050 109 2 total
Standard Linux:
# strace -c /bin/sh -c /bin/echo foo
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
 22.90 0.000982 109 9 2 open
 22.85 0.000980 980 1 execve
 10.87 0.000466 29 16 old_mmap
 10.45 0.000448 448 1 write
 7.06 0.000303 51 6 read
 6.67 0.000286 10 30 brk
 3.61 0.000155 78 2 access
 3.50 0.000150 75 2 stat64
 2.91 0.000125 42 3 munmap
 2.24 0.000096 14 7 close
 2.12 0.000091 13 7 fstat64
 1.84 0.000079 7 11 rt_sigaction
 1.03 0.000044 7 6 rt_sigprocmask
 0.72 0.000031 10 3 uname
 0.19 0.000008 8 1 geteuid32
 0.16 0.000007 7 1 time
 0.16 0.000007 7 1 getppid
 0.16 0.000007 7 1 getpgrp
 0.16 0.000007 7 1 getuid32
 0.14 0.000006 6 1 getpid
 0.14 0.000006 6 1 getgid32
 0.12 0.000005 5 1 getegid32
------ ----------- ----------- --------- --------- ----------------
100.00 0.004289 112 2 total
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