[openib-general] [PATCH][SDP] AIO buffer corruption

[Steven Wooding]

Hello Libor,

I've tried your patch, but unfortunately it made no difference to the -32/-104 
errors I get. I have observed the following features, which may help you 
diagnose my problem:

1. Sometimes the receiver reports -32 and the transmitter -104, but other 
times the errors are reversed.

2. The number of ping-pongs seems to be the main factor. However, the value of 
-n at which ttcp.aio fails is not fixed, if all other parameters are the 
same.

3. -32/-104 error occurs for a much smaller value of -n if -a is 1 to 3.

4. This maybe unrelated, but I see very poor performance for -a = 1 (50 - 75 
MB/s). If -a is larger that 4 then the performance comes back (400 - 900 
MB/s).

Is there are other information I can supply to help you?

Hope this finds you well.

Cheers,

Steve.

Platform: 64 bit
OS: RHEL 4
Kernel: 2.6.11.6
OpenIB gen2: 2225
SM: IO5000 switch