Completely disabling RTS/CTS

Krishna Chaitanya chaitanya.mgit at
Thu Jul 21 07:29:14 PDT 2016

On Thu, Jul 21, 2016 at 7:45 PM, Raj Joshi <rajjoshi at> wrote:
> Hi all,
> I am trying to "completely" disable RTS/CTS.
> * Case 1: Using iw/iwconfig when I set the sender's RTS threshold to a
> very high value (RTS thr=10000 B), I expect that no RTS should be
> sent. However, it seems that this threshold is not being honored and I
> can sniff large number of RTS/CTS frames. I verified that no A-MSDU is
> exceeding 10000 B.
> * Case 2: Interestingly, when I set the sender's RTS threshold to off
> (RTS thr:off), compared to case #1 much less number of RTS/CTS frames
> are seen and throughput is seen to improve. But I can still see
> RTS/CTS frames being sent.
> * Since the channel is clear and much isolated, and there is just one
> AP and one STA, there is negligible chance of other factors playing
> any role.
> * There is one change though that I have disabled dynamic bandwidth
> i.e. ar->wmi.pdev_param->dynamic_bw set zero in mac.c. I believe this
> is likely not an issue as similar RTS/CTS behavior is seen even with
> dynamic_bw set to 1 (there are no heterogeneous channel widths in the
> network in any case).
> * Another thing I noticed is that the RTS/CTS protection mode if set,
> it is set to CTS-to-self, rather than "RTS/CTS" i.e.
> ar->wmi.vdev_param->protection_mode in mac.c is either set to 1 or 0
> (depending upon use_cts_prot), but not 2. This probably seems not
> helpful in hidden node scenarios as the CTS frame is unicasted instead
> broadcasting.
> I would appreciate any pointers on completely disabling RTS/CTS as
> well as the ability to choose between complete RTS/CTS versus
> CTS-to-self whenever RTS/CTS is enabled.
Which mode is this? For aggregated frames (AMPDU) RTS Threshold is
not checked, so it can still be enabled

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