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SubjectRe: anyone ever done multicast AF_UNIX sockets?
On Mon, 2003-03-03 at 19:56, David S. Miller wrote:
From: Chris Friesen <>
Date: Mon, 03 Mar 2003 14:11:07 -0500

I haven't done UDP bandwidth testing--I need to check how lmbench
did it for the unix socket and do the same for UDP. Local TCP was
far slower than unix sockets though.

That result is system specific and depends upon how the data and
datastructures hit the cpu cachelines in the kernel.

TCP bandwidth is slightly faster than AF_UNIX bandwidth on my
sparc64 boxes for example.

I've seen that their are the same on linux.I tried to to do AF_UNIX
instead of AF_INET internally to boost perf, but to no avail. Makes you
suspect that the loopback device actually create an AF_UNIX connection
under the hood ;-)


Terje Eggestad
Scali Scalable Linux Systems

Olaf Helsets Vei 6 tel: +47 22 62 89 61 (OFFICE)
P.O.Box 150, Oppsal +47 975 31 574 (MOBILE)
N-0619 Oslo fax: +47 22 62 89 51

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