time command wrong values

satpal parmar parmarsatpal at gmail.com
Wed Feb 21 09:23:10 UTC 2007


Hi all;

             I am facing a very weird problem. I have ported linux kernel
2.6.18.2 on arm 9 base board.When I use time command from buzybox to
understanding the performance characteristics of a single program I am
getting  some finite values for real but sys and user values are always
zero.


/ # dd if=/dev/ram0  of=/dev/ram1  count=10000000
16384+0 records in
16384+0 records out

/ # time dd if=/dev/ram0  of=/dev/ram1  count=10000000
16384+0 records in
16384+0 records out
real    0m 0.80s
user    0m 0.00s
sys     0m 0.00s

/ # time dd if=/dev/ram0  of=/dev/ram1  count=100000000
16384+0 records in
16384+0 records out
real    0m 0.80s
user    0m 0.00s
sys     0m 0.00s

/ # time dd if=/dev/ram0  of=/dev/ram1  count=1000000000
16384+0 records in
16384+0 records out
real    0m 0.80s
user    0m 0.00s
sys     0m 0.00s
/ # time dd if=/dev/ram0  of=/dev/ram1  count=1000
1000+0 records in
1000+0 records out
real    0m 0.06s
user    0m 0.00s
sys     0m 0.00s

When I tried this same load *on linux system* I get following values.

time dd if=/dev/ram0  of=/dev/ram1  count=1000

real    0m0.022s
user    0m0.000s
sys     0m0.002s

Am I doing things wrong? My uneducated  guess is that there can some problem
in BSp side . Any thoughts?

Thanks in adavnce.

satpal
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