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NetBSD 6.1.5 - man page for kttcp (netbsd section 4)

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

     kttcp -- kernel support for testing network throughput

     pseudo-device kttcp

     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 applica-
	  tions 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 scheduling model, kttcp pro-
	  vides a benchmark model where preemption of the benchmark program is not an issue.

     pkgsrc/benchmarks/kttcp, pkgsrc/benchmarks/ttcp

BSD					 December 2, 2006				      BSD

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