[hostap] WPA/RSN IBSS scp throughput is only 1/10 of Open IBSS?

Ben Greear greearb at candelatech.com
Mon Mar 6 06:28:31 PST 2017

On 03/06/2017 01:40 AM, Jouni Malinen wrote:
> On Mon, Mar 06, 2017 at 01:03:42PM +0800, Xuebing Wang wrote:
>> I am using 2 Ubuntu PCs to build a RSN IBSS, and RSN IBSS scp throughput is
>> only 1/10 of Open IBSS.
>> -  Ubuntu 1: Ubuntu 14.04.5 on Lenovo Thinkpad intel wifi chip 802.11n
>> (wpa_supplicant v2.1)
>> -  Ubuntu 2: Ubuntu 16.04.1 on desktop PC with ath9k (wpa_supplicant v2.4)
>> My conf file is as below. ipv6 scp throughput is about 70KB/s.
>> After change to (key_mgmt=NONE) (from key_mgmt=WPA-PSK), ipv6 scp throughput
>> is about 750KB/s (10 times higher).
>> Is this expected? Should I try the latest wpa_supplicant?
>> I first saw this on my OpenWRT board (wpa_supplicant v2.5-devel), so
>> wpa_supplicant version seems not directly relevant?
> wpa_supplicant is not involved in actual transmission and encryption of
> the Data frames, so it is unlikely to make any difference which version
> is used. The throughput results are dependent on the used hardware and
> driver, so this would be a question to the driver/hardware vendors
> rather than this mailing list.

My guess is that the system is using software-crypt in IBSS mode, and
that is the reason everything is slow.  I am not sure of a good way to
verify that though.


Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

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