Re: [Dataspace-sabul] AMD64 Question.

[Steven M. C. <sc...@or...>]

On Mon, 23 Feb 2004, Yunhong Gu wrote:

> 
> Hi, Steven,
> 
> I never tried UDT on an Opteron machine to test, but it should NOT matter 
> that UDT is running on Xeon or Opteron, or any other CPU. There are 
> assembly code in UDT for Intel CPUs; on other CPU it simply uses the 
> system calls provided by OS. And since you have use it successeully for 
> memory-memory transfer, it seems the problem is related to file 
> operations.
> 
> Can you let me know more details of the problem? Does the file transfer 
> always fail (no matter what the file size is)? Does it work fine on other 
> machines (e.g, between two Xeon machines) with the same OS?

The memory to memory tests seems to work when unet2 (Opteron) sends to
unet1 (Xeon), but not the other way.  The same is true with small file
transfers.  Large file transfers die with "File size limit exceeded".

Also, setting UDT_MTU in appserver.cpp doesn't seem to work.  It still 
uses an MTU of 1500.

My notes are at:
http://www.ccs.ornl.gov/~scarter/net100/udpblaster/udt.html

Thanks,

Steven.

-- 
sc...@or...
Oak Ridge National Laboratory