netdev - Re: [PATCH] b43: Increase number of RX DMA slots

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Message-ID: <CACna6rwLgE+o2mcRTemLFAqzdsEoA9Xyx8GyEQTh5qbv1iZ04A@mail.gmail.com>
Date:	Mon, 18 Feb 2013 17:18:34 +0100
From:	Rafał Miłecki <zajec5@...il.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	linville@...driver.com, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, Bastian Bittorf <bittorf@...ebottle.com>,
	Stable <stable@...r.kernel.org>
Subject: Re: [PATCH] b43: Increase number of RX DMA slots

2013/2/18 Larry Finger <Larry.Finger@...inger.net>:
> Bastian Bittorf reported that some of the silent freezes on a Linksys WRT54G
> were due to overflow of the RX DMA ring buffer, which was created with 64
> slots. That finding reminded me that I was seeing similar crashed on a netbook,
> which also has a relatively slow processor. After increasing the number of
> slots to 128, runs on the netbook that previously failed now worked; however,
> I found that 109 slots had been used in one test. For that reason, the number
> of slots is being increased to 256.

So probably ideal solution is to use 128 *and* fix the driver's
failing on overflow ;)

Did you try it on some old device? Just for sure firmware&DMA will
handle it correctly.

-- 
Rafał
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