On Mon, May 25, 2020 at 11:46:22PM +0200, stolen data wrote: > On Sat, May 23, 2020 at 9:57 AM Stefan Sperling <s...@stsp.name> wrote: > > > On Fri, May 22, 2020 at 05:12:23PM +0200, stolen data wrote: > > > On Thu, May 21, 2020 at 9:11 AM Stefan Sperling <s...@stsp.name> wrote: > > > > > > > On Thu, May 21, 2020 at 01:04:36AM +0200, stolen data wrote: > > > > > > > > ... > > > > > > > > > > > > > You can try MCS1, MCS2, ..., all the way up to MCS15. > > > > > > > > > > Unfortunately no change. Some are unusable but none of them offer a > > > > > visible improvement. > > > > > > > > Oh. So they all have the exact same result? > > > > > > > > > > None of MCS0-15 can reach beyond 1200 Kbit/s and some are exceptionally > > > unstable; 5-7 and 13-15 (with emphasis on 7 and 15) are so shaky that > > > the speed drops below 50 Kbit/s and sometimes cause the entire link to > > > choke and drop out. Across the range it seems to be best at 0/8 and > > > degrade towards 7/15. I can't see any difference between the lower and > > > upper range, and autoselect overall seems to work out better over time > > > despite still being very jumpy. > > > > > > > On AR9280 OpenBSD athn(4) will easily do 10 Mbit/s under good conditions, > > if not more. Which is fairly bad given what the hardware is capable of. > > But not nearly as bad as what you're seeing. > > > > It really sounds like a case where someone with AR9287 hardware in front > > of them will need to debug the driver. > > > > Recording packet captures with another device in monitor mode might be > > worth doing just to see if it sheds some light on the problem. > > > > Would you be able to instruct me in how to capture traffic for this > particular scenario? Assuming a packet dump from my end would be of > any help that is.
On another OpenBSD machine that is in range of the AR9287 device and the AP, put, ideally an iwn(4) or iwm(4) wireless device into monitor mode, and use tcpdump to record a pcap file: ifconfig iwn0 mediaopt monitor chan 1 tcpdump -n -i iwn0 -y IEEE802_11_RADIO -s 4096 -w /tmp/iwn.pcap Adjust the channel number as needed. The pcap file can be read with tcpdump -r or with wireshark from ports. Whether or not this will be of any help is hard to tell ahead of time. In the worst case we learn nothing new.
