Date: Wed, 19 Jul 2006 12:01:54 -0400 From: Dillon <turtle@loveturtle.net> To: freebsd-stable@freebsd.org Subject: Re: ath driver transmits frames only after a low watermark is filled Message-ID: <44BE5772.2090608@loveturtle.net> In-Reply-To: <200607172111.08919.vsemionov@gmail.com> References: <200607172111.08919.vsemionov@gmail.com>
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Sounds like what always happens when crappy power management stuff is enabled either on the station or the ap. I would investigate that first. Victor Semionov wrote: > Hello list, > > I have a wireless card with an Atheros 5212 chipset and I'm experiencing the > following behavior under FreeBSD 6.1: > > TCP connections that consist of small short bursts of one-way (transmission) > traffic often stall until traffic is received over another TCP connection. > For example, if I try to load a small web page, located on the FreeBSD box, > over the wireless link, it doesn't load completely, unless I hit return in a > concurrent terminal session, or until I request some other file hosted on the > FreeBSD box, or until I wait 20 seconds or so. The signal is not low, the two > wireless boxes are in the same room. > > Higher-bandwidth connections rarely stall. This makes me think there is some > kind of low watermark functionality in the hardware/driver that doesn't send > frames until a certain number of them have been queued for transmission, or > until a frame has been received. Also, I guess this is the reason that the > ath module caused the system to freeze at shutdown or when the module is > unloaded, unless I do an "ifconfig ath0 down" before unloading - the > unloading code is probably waiting for all queued frames to be transmitted, > but that never happens. > > Sorry for the weak conclusion that is based on assumptions. I'm not familiar > with the OS/driver internals and don't know how to investigate further. Is > there a sysctl or other setting that controls this behavior, or some other > workaround? Any help would be greatly appreciated. > > Best regards, > Victor Semionov > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
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