question wrt context switching during disk i/o

[Mike Galbraith]

Hi,

This is something that has been bugging me for a while.  I notice
on my system that during disk write we do much context switching,
but not during disk read.  Why is that?

   procs                      memory    swap          io     system         cpu
 r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
 0  1  1      0   1940    588 113672   0   0     0  3526  216  3707   0  14  86
 0  1  1      0   1940    588 113672   0   0     0  3567  218  3722   0  15  85
 0  1  1      0   1940    588 113672   0   0     0  3567  216  3711   0  18  82
 0  1  1      0   1940    588 113672   0   0     0  3412  213  3712   0  15  85
 1  1  1      0   1940    588 113672   0   0     0  3628  218  3669   0  13  87
 0  1  1      0   1460    588 114152   0   0     0  3505  215  3744   0  17  83
 1  0  1      0   1460    588 114148   0   0  2417   310  262   680   0   6  94
 1  0  1      0   1460    588 114148   0   0  3520    31  324   620   0  16  84
 2  0  1      0   1460    588 114148   0   0  3488    31  321   623   0  10  90
 1  0  1      0   1460    588 114148   0   0  3168   310  307   590   0  18  82
 1  0  1      0   1460    588 114148   0   0  3584     0  327   626   0  12  88
 1  0  1      0   1460    588 114148   0   0  3520    62  322   612   0  12  88
 1  0  1      0   1460    588 114148   0   0  3488    31  320   675   0  15  85

        -Mike

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