Re: Very slow transfers to/from micro SD card on a RPi B+

["William A. Mahaffey III" <wam%hiwaay.net@localhost>]

On 08/04/15 10:49, Stephan wrote:
> These are my numbers on a class 10 Sony-SD-card when extracting 
> pkgsrc.tar.
>
>       tty              ld0             CPU
>  tin tout  KB/t  t/s  MB/s  us ni sy in id
>    1  130 27.20   83 2.206   1  0  4  1 93
>    0  132 7.333  186 1.329   0  0  0  0 100
>    0   45 7.839  258 1.978   0  0  1  0 98
>    0   44 7.134  192 1.338   0  0  1  1 97
>    0   44 7.806  215 1.638   0  0  0  0 99
>    0   44 7.483  238 1.737   0  0  1  1 98
>    0   44 7.250  158 1.122   0  0  1  0 99
>    0   44 7.744  255 1.932   0  0  2  1 97
>    0   44 6.830  169 1.129   1  0  4  0 95
>    0   44 7.379  201 1.448   0  0  1  0 99
>    0   44 7.702  226 1.698   0  0  1  1 98
>    0   44 7.391  218 1.572   0  0  0  0 100
>    0   45 7.161  215 1.503   0  0  1  1 98
>    0   44 7.164  223 1.559   0  0  1  0 99
>    0   44 7.701  192 1.445   0  0  1  0 99
>    0   44 7.600  262 1.947   0  0  1  1 97
>       tty              ld0             CPU
>  tin tout  KB/t  t/s  MB/s  us ni sy in id
>    0   44 9.719  183 1.738   0  0  1  0 99
>    0  131 8.244  178 1.435   0  0  0  1 99
>    0   44 7.861  242 1.855   0  0  0  0 100
>    0   45 7.539  215 1.582   0  0  0  1 99
>    0   44 7.020  196 1.344   0  0  1  0 99
>    0   44 7.266  216 1.532   0  0  3  0 97
>    0   44 7.798  186 1.417   0  0  1  1 98
>    0   44 7.184  221 1.549   0  0  1  0 99
>    0   44 7.703  234 1.758   0  0  1  0 99
>    0   44 7.268  211 1.497   0  0  1  1 98
>    0   44 8.064  185 1.458   0  0  2  0 97
>    0   44 7.485  257 1.882   0  0  1  1 98
>    0   44 7.235  215 1.518   0  0  1  0 98
>    0   44 7.071  194 1.340   0  0  0  0 100
>    0   45 7.667  220 1.646   0  0  1  1 98
>    0   44 6.915  232 1.564   0  0  1  0 99
>       tty              ld0             CPU
>  tin tout  KB/t  t/s  MB/s  us ni sy in id
>    0   44 7.703  180 1.356   0  0  0  1 99
>    0  131 6.975  240 1.632   0  0  2  0 98
>
> Sequential write is about 6 MB/s on average.

How do you get 6 MB/s, unless I am reading something wrong, it looks 
more like 1.5 MB/s to me .... $0.02, no more, no less ....

--

	William A. Mahaffey III

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