bin/50045: wpa_supplicant unreliable, dropping connections

[pbraun%nethence.com@localhost]

>Number:         50045
>Category:       bin
>Synopsis:       wpa_supplicant unreliable, dropping connections
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jul 12 12:55:00 +0000 2015
>Originator:     pierre-philipp
>Release:        7.0_RC1 and current
>Organization:
Nethence
>Environment:
tested with 7.0_RC1 kernel & user land
tested with current (2015 07 10) kernel & user land
probably with older releases also
>Description:
Very similar to problem report 32536
http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=32536

Using wpa supplicant, the connection drops when I download something, i.e. pkg_add some package remotely with PKG_PATH pointing to my nearest mirror in my country.  It seems to happens when ever there is high traffic as mentionned in the other problem report.  I do not do any ssl tunnel and I get the same trouble.

I use the wpi driver.  If you want I will try with some atheros card eventually to see if it also happens with it.  I don't know if it is related to the driver, wpa_supplicant or something else. Nothing appears in the logs, just no network when it's heavily sollicitated.

I tried wpa supplicant on FreeBSD 10.1 release and there is no issue with it, it holds the load just fine. Too bad I would like to use NetBSD on that laptop. Thank you.
>How-To-Repeat:
wpa_supplicant.conf:
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel

network={
        ssid="MYWLAN"
        scan_ssid=1
        key_mgmt=WPA-PSK
        psk="MySecretPassphrase"
}

called with:
wpa_supplicant -B -i wpi0 -c /etc/wpa_supplicant.conf
dhclient wpi0

The AP provides WPA/WPA2 AES-TKIP.
>Fix: