Commits on Jul 19, 2016

1. msg/simple: apply prefetch policy more precisely …

   We shall apply prefetch policy based on the residual length aftering
   checking cache instead of the original request length.
   
   E.g., if the reading sequences are 1K, 5K, 2K, the improved logic
   will trigger another prefetch of 4K(as 5K - 3K(from recv_buf) == 2K, and we
   now have 8K prefetched data total) by the second 5K reading(which we
   don't do this according to the old logic), and thus the last reading request
   which asks for 2K data can be also benefited from this prefetch too,
   which is good for performance.
   
   Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>

   

   xiexingguo committed Jul 19, 2016
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