[RFC][PATCH] b43: do not try sending packets when ring can be full

[Rafał Miłecki]

W dniu 12 czerwca 2011 20:48 użytkownik Michael Büsch <m at bues.ch> napisał:
> On Sun, 12 Jun 2011 20:15:53 +0200
> Rafał Miłecki <zajec5 at gmail.com> wrote:
>> Well, as I said, we may be unable to transmit the first element of the
>> queue, but 2nd/3rd/... may be for different ring (qos) (we can
>> transmit).
>>
>> Looping through the whole queue every time, just to find packets we
>> may transmit, sounds surely as a bad idea.
>
> I don't think so. It's not that this is an actual queue anyway. It just acts
> as a buffer to queue up one or two packets in the small race window of
> actually filling up the DMA rings and stopping the mac80211 queue.
> (It also acts as a context dispatcher in the first place, though).
>
> So the "looping through the queue" just means checking if one or two packets
> can be transmitted now.

Ouch, I didn't though about stopping queue. Yeah, length of that queue
should not reach big sizes...

-- 
Rafał