D state when high load on same static file.

[atrus]

I have tried : sendfile, aio, directIO with the same scenario, same
buffer size, ...
But it seems that directIO is the best, when I turn to Aio or sendfile,
the output bandwidth become less than directIO (about 200Mbps, just 10%
compares to directIO )

Is there anything tweak that relates to this problem ?

Thanks all guys.
Atrus@

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,220365,220379#msg-220379