Message: 1 Date: Tue, 7 Oct 2014 17:17:40 +0200 From: Bastian Bittorf
<bitt...@bluebottle.com> To: mailinglist
<openwrt-devel@lists.openwrt.org> Subject: Re: [OpenWrt-Devel] Q:
mac80211: default distance-settings 0 Message-ID:
<20141007151740.gj29...@medion.lan> Content-Type: text/plain;
charset=us-ascii * Felix Fietkau <n...@openwrt.org> [07.10.2014 13:40]:
On 2014-10-07 08:15, Bastian Bittorf wrote:
because 0 seems to be a valid value:
0 does not imply dynamic ACK, it is simply the minimum value.
Enabling dynack by default would be a bad idea.
what does 0 mean? the wiki says: 0 meters away, so a short
ack-timeout is used, or is '0' something special, eg. driver default?
i tested a p2p/longshot here, where both stations are 350m away, but
invoking on both sides:
iw phy phy0 set distance 350
shows, that the link gets really worse, also with 500 or 2000.
can't it be changed during runtime?
bye, bastian
------------------------------
Bastian-
I was doing some tests last week using an access point running a CC
trunk build.
I remembered that the "right" value was supposed to be the actual
distance*2 (essentially, counting "out and back" distance).
My test link was at about 8 km. I tried a number of values (on both AP
and client) - distance=15000, 10000, and then just backed it off by 1000
incrementally - and the throughput (measured with iperf) got better as I
went down in distance. The optimal throughput was at distance=5000,
where it was about 5 Mbps. However, when I set it at distance=4000,
suddenly throughput went to less than 200 Kbps.
"Real world" observations, FWIW...
-Bill
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