kern/165969: Slower performance in adhoc mode vs Client/AP mode,
>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:
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