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

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Message-ID: <CA+XFjipJHGTvzUx6yy1DTc74kbrPEQxM08zW=N1uf43=Q6pwdg@mail.gmail.com>
Date:	Wed, 20 Feb 2013 07:26:01 +0100
From:	Gábor Stefanik <netrolller.3d@...il.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Julian Calaby <julian.calaby@...il.com>,
	David Miller <davem@...emloft.net>, David.Laight@...lab.com,
	linville@...driver.com, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, bittorf@...ebottle.com,
	stable@...r.kernel.org
Subject: Re: [PATCH] b43: Increase number of RX DMA slots

On Wed, Feb 20, 2013 at 3:42 AM, Larry Finger <Larry.Finger@...inger.net> wrote:
> On 02/19/2013 06:47 PM, Julian Calaby wrote:
>>
>>
>> Is it be possible to increase the number of slots at runtime? Maybe an
>> even better solution would be to keep the existing number of slots,
>> and if they run out, reset and increase incrementally to some sensible
>> maximum value.
>
>
> The number could be increased a bit, but on systems with 32-bit DMA such as
> the BCM4318, the maximum size of the ring buffer is 4KB. Even more
> importantly, each slot is allocated an skb of 2390 bytes. Even at 256 slots,
> the memory allocation is pretty large.
>
> Larry
>

Is this an issue that vendor drivers are also vulnerable to? If it is
a firmware issue, I would certainly think so.
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