Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 03 Mar 2003 16:32:56 -0500 | From | Chris Friesen <> | Subject | Re: anyone ever done multicast AF_UNIX sockets? |
| |
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
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| ![\](/images/icornerr.gif) |