Re: [Madwifi-devel] disable cca but low pps at the receiver
Status: Beta
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From: zbdou <dz...@fo...> - 2010-06-26 16:53:19
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I tried, but no improvements. I changed the channel to 3, which has less external interference. With cca enabled, the maximum throughput is 4500pps (54Mbps, 1000-byte broadcast frames). but after disable cca at the sender, if we set the sending interval of pktgen to tx 4500pps, the receiver could only get throughput of 400pps, so strange! I think there is something wrong with the patch. try increasing the acktimeout using sysctl -w dev.wifi0.acktimeout=30 play around with couple of values and see what happens. from what i have observed value of around 25 us works .. with slightly higher value, the cca is not disabled :) (which i find strange) On Sat, Jun 26, 2010 at 9:49 PM, dead cow <dz...@fo...> wrote: Hi, vishal, I send boradcast frames using pktgen. The ubiquity XR2 cards are used for this test. zbdou. Have you disabled the ack also or ack is enabled?? and what hardware are you using?? for ar5212 based ubiquiti and mikrotik cards what i observed is if i do large file transfer of 20-30 mb using scp, then the transfer stall midway. so am doubtful if the patch works accurately. vishal On Sat, Jun 26, 2010 at 9:34 PM, dead cow <dz...@fo...> wrote: Hi, all I have disabled cca/ csma,ca based on: https://systems.cs.colorado.edu/projects/carp/browser/trunk/patches/noCCA.patch It really works. But the problom is when the sender sends at the full speed at 802.11g, fixed rate 54Mbps, 1000-byte frame, (around 5500 packet per frame), the receiver could receive almost no frames. This situation is substantially mitigated when the sender transmits at a lower speed (e.g. 2600pps), at the receiver, we got 2300pps. Does anyone know the reason about this strange problem? Thanks! 2010-06-26 dead cow ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Madwifi-devel mailing list Mad...@li... https://lists.sourceforge.net/lists/listinfo/madwifi-devel |