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KTTCP(4)		 BSD Kernel Interfaces Manual		      KTTCP(4)

NAME
     kttcp — kernel support for testing network throughput

SYNOPSIS
     pseudo-device kttcp

DESCRIPTION
     This driver provides kernel support for testing network throughput from
     the perspective of the kernel.  It is similar in spirit to the classic
     ttcp network benchmark program, the main difference being that with
     kttcp, the kernel is the source and sink of the data.

     Testing like this is useful for a few reasons:

     1.	  This allows us to know what kind of performance we can expect from
	  network applications that run in the kernel space, such as the NFS
	  server or the NFS client.  These applications don't have to move the
	  data to/from userspace, and so benchmark programs which run in
	  userspace don't give us an accurate model.

     2.	  Since data received is just thrown away, the receiver is very fast.
	  This can provide better exercise for the sender at the other end.

     3.	  Since the NetBSD kernel currently uses a run-to-completion schedul‐
	  ing model, kttcp provides a benchmark model where preemption of the
	  benchmark program is not an issue.

SEE ALSO
     pkgsrc/benchmarks/kttcp, pkgsrc/benchmarks/ttcp

BSD			       December 2, 2006				   BSD

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