help! Problem in udp performance between with_os and no_os.

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help! Problem in udp performance between with_os and no_os.

Wang Zheng
hi,
I have ported the lwip into philips PNX1500 with psos.
there is a problem:
 
The udp demo programmed with rawAPI.
It can send data on 11Mbytes/sec and receive on 9Mbytes/sec without os.
But with the psos, it can only send on 6M/byte and receive on 5.5Mbytes/sec.
 
Why is there a so sharp decrease ? Is it reasonable?
 
Thanks.
 


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