From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Friesen Subject: Re: anyone ever done multicast AF_UNIX sockets? Date: Mon, 03 Mar 2003 16:32:56 -0500 Sender: linux-net-owner@vger.kernel.org Message-ID: <3E63CA08.4040209@nortelnetworks.com> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: "David S. Miller" , linux-kernel@vger.kernel.org, netdev@oss.sgi.com, linux-net@vger.kernel.org Return-path: To: Terje Eggestad List-Id: netdev.vger.kernel.org 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 -- Chris Friesen | MailStop: 043/33/F10 Nortel Networks | work: (613) 765-0557 3500 Carling Avenue | fax: (613) 765-2986 Nepean, ON K2H 8E9 Canada | email: cfriesen@nortelnetworks.com