Am 16.05.2019 um 21:40 schrieb Ben Greear:
On 5/15/19 6:00 AM, Ben Greear wrote:
On 5/15/19 5:26 AM, Sebastian Gottschall wrote:
Am 15.05.2019 um 14:20 schrieb Ben Greear:
On 05/14/2019 09:26 PM, Sebastian Gottschall wrote:
can you send me a detailed instruction for testing this on my
devices? so which commands have been used for generating the
traffic etc. (iperf3?)
I am using our own traffic generator, but I imagine iperf3 should
work fine too.
I am testing on x86-64 and so forth. Maybe you can test with UDP
small-packet load on your platform
in routed mode (ie, external iperf generator through your AP) and
see if you see issues?
thats the plan. can you do a test with iperf3 to see if its
reproduceable. i mean i will test it on ipq based boards and x64.
but to make sure that the scenario
is identical which raised up your issue, it would be find if we have
identical software for testing including the same options
I think I found the issue. The rate-ctrl logic in the firmware allows
a transition from HT/VHT 20 MCS0 down to OFDM rates.
It seems the hardware does not like to see an AMPDU with an OFDM rate
for 20Mhz and a VHT rate for 80Mhz (or maybe just the
single OFDM rate is the fault).
If you can edit firmware, then setting this to 0 probably fixes the
issue.
g_rc_cck_rate_allowed
according to the code this variable has only effect on 2.4 ghz. the
fallback to cck rates will only be done if phymode is 2.4 ghz
I think to reproduce you'd need to send high speed traffic in a
situation where the
RF environment is going to make rate-ctrl fail quite a bit. (Slow
speed should
work too, but it would likely take a lot longer).
And, it is always possible that whatever I saw when testing
mostly-stock FW is different
from what I eventually debugged to in my firmware. Still, from
looking at MCS vs SNR
charts, there seems to be no advantage to trying OFDM vs MCS0 for 20Mhz.
Thanks,
Ben
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