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Re: anyone ever done multicast AF_UNIX sockets?

To: Terje Eggestad <terje.eggestad@xxxxxxxxx>
Subject: Re: anyone ever done multicast AF_UNIX sockets?
From: Chris Friesen <cfriesen@xxxxxxxxxxxxxxxxxx>
Date: Mon, 03 Mar 2003 16:32:56 -0500
Cc: "David S. Miller" <davem@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx, linux-net@xxxxxxxxxxxxxxx
References: <3E6399F1.10303@nortelnetworks.com> <20030303.095641.87696857.davem@redhat.com> <3E63A8CB.2090307@nortelnetworks.com> <20030303.105646.02089773.davem@redhat.com> <1046720532.28127.213.camel@eggis1>
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Terje Eggestad wrote:
On Mon, 2003-03-03 at 19:56, David S. Miller wrote:

    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 ;-)

On my P4 1.8GHz, AF_INET vs AF_UNIX looks like this:


*Local* Communication latencies in microseconds - smaller is better ------------------------------------------------------------- Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP ctxsw UNIX UDP TCP conn --------- ------- ----- ----- ---- ----- ----- ----- ----- ---- pcard0ks. 2.4.18- 1.740 10.4 15.9 20.1 33.1 23.5 44.3 72.7 pcard0ks. 2.4.18- 1.560 10.6 16.0 23.4 38.1 36.1 44.6 77.4


*Local* Communication bandwidths in MB/s - bigger is better ----------------------------------------------------------- Host OS Pipe AF TCP File Mmap Bcopy Bcopy Mem Mem UNIX reread reread (libc) (hand) read write --------- ------- ---- ---- ---- ------ ------ ------ ------ ---- ----- pcard0ks. 2.4.18- 650. 677. 151. 721.9 958.0 290.8 288.8 955. 418.4 pcard0ks. 2.4.18- 379. 701. 163. 714.8 949.5 289.5 288.5 956. 420.5


On this machine at least, UDP latency is 25% worse than AF_UNIX, and TCP bandwidth is about 22% that of AF_UNIX.


Chris

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