Date: Mon, 12 Mar 2012 10:59:59 GMT From: Johann <jhugo@meraka.csir.co.za> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/165969: Slower performance in adhoc mode vs Client/AP mode, same HW (atheros adapters) Message-ID: <201203121059.q2CAxxWh095338@red.freebsd.org> Resent-Message-ID: <201203121100.q2CB0RJC062850@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
>Number: 165969 >Category: kern >Synopsis: Slower performance in adhoc mode vs Client/AP mode, same HW (atheros adapters) >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Mar 12 11:00:26 UTC 2012 >Closed-Date: >Last-Modified: >Originator: Johann >Release: FreeBSD 9.0-STABLE >Organization: CSIR >Environment: FreeBSD jhugo-rtr 9.0-STABLE FreeBSD 9.0-STABLE #7: Tue Feb 14 13:50:42 SAST 2012 jhay@magrathea.meraka.csir.co.za:/var/scratch/9-stable/obj/arm.armeb/var/scratch/9-stable/src/sys/SMALL-AVILA arm >Description: I get lower throughputs in adhoc mode, compared to AP/client mode for the same two devices. AP -> client iperf 27.2 MBytes 28.8 Mbits/sec adhoc -> adhoc iperf 12.1 MBytes 21.3 Mbits/sec dev.ath.0.stats.ast_tx_longretry is more than double in adhoc mode. The two devices are directly next to each other in the LAB HW platform = Gateworks Avila GW2348-4 Wifi adapters = Compex WLM54AGP23 Atheros driver from +- 10 Jan 2012 OS = FreeBSD 9.0-STABLE Adhoc mode for FreeBSD 9.0-STABLE (as well as FreeBSD 8.0-STABLE) are also slower than adhoc mode for FreeBSD 7.2-STABLE 9.0-STABLE adhoc -> adhoc iperf 21.3 Mbits/sec 8.0-STABLE adhoc -> adhoc iperf 21.3 Mbits/sec 7.2-STABLE adhoc -> adhoc iperf 25.1 Mbits/sec >How-To-Repeat: - Place two wifi nodes next to each other. - Configure one device into AP mode and the other onto client mode. - Do an iperf between the two nodes. iperf 28.8 Mbits/sec - Now use the same two devices and configure them into adhoc mode. - Do an iperf between the same two nodes. iperf 21.3 Mbits/sec >Fix: >Release-Note: >Audit-Trail: >Unformatted:
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201203121059.q2CAxxWh095338>