While running throughput experiments using iperf I noticed that UDP throughput in ad-hoc mode was considerably lower than in Infrastructure mode. The setups I'm comparing is a 802.11a ad-hoc network consisting of two clients vs a 802.11a infrastructure network consisting of an access point and a client (11a because the tests were run in the 5GHz band). For ad-hoc mode I'm consistenly seeing a lower throughput than for infrastructure mode: i.e. 22.4 Mbits/sec vs 28.2 Mbits/sec. Note that while sniffing the medium radiotap headers report a PHY data rate of 54Mbit/s in both cases. There is no other traffic on the Wi-Fi channel in question (44). Considering the medium access for both setups is similair I would expect to find similair throughputs. Is this a known issue with the linux wireless/mac80211/ath9k driver stack or is this behaviour conform the 802.11 standard (based on my knowledge I would say no to the latter)? My test specs are below. For testing I'm using Sparklan WPEA-111N NIC's (AR9280). The nodes are running OpenWrt attitude adjusment on r32482 (from 2012-06-21) with the REGD patch enabled. I believe that this build of OpenWRT uses the compat-wireless-2012-06-14.tar.bz2 drivers. Kind regards, Floris -- Floris Van den Abeele Department of Information Technology Internet Based Communication Networks and Services (IBCN) Ghent University - iMinds Gaston Crommenlaan 8 (Bus 201), B-9050 Gent, Belgium M: +32 (0)494 24 92 76 E: floris.vandenabeele@xxxxxxxxxxxxxx W : www.ibcn.intec.UGent.be -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
