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Re: lug-bg: kernel module programming
- Subject: Re: lug-bg: kernel module programming
- From: danchev@xxxxxxxxx (George Danchev)
- Date: Mon, 25 Jun 2001 08:35:38 +0300
ste e nai-dobre da popitash na
http://www.linux-mm.org/mailinglists.shtml
ili da razgledash archiva im . Obsujdat se dosta interesni raboti za 2.4 MM ,
i to ot samite developers.
On Monday 25 June 2001 01:28, you wrote:
> Kato stana vapros za kernel-module-programming da popitam i az neshto:
> Zna4i imam Slave DMA(ISA) - DMA transferite ot/kym pametta triabva da
> sa v ramkite na pyrvite physical 16MB.
> Niakade biah 4el 4e "skb" bufferite koito se zadeliat network layer-a,
> sa
> NONPAGEBLE i sa na adresi < 16MB.
> No pyk v niakolko mrejovi river-a ( Predimno za ISA NE2000 compat. ETH )
> zabeliazah 4e se polzwat dopylnitelni buferi - koito sa pod phys 16MB i
> sa
> NONPAGEBLE pri izprashtane se pravi kopirane ot skb->data -> bouncing
> buffer i obratno pri priemane bouncing buffer -> skb->data.
> Vaprosa mi : Znaeli niakoi sys sigurnost v 2.4 dali skb buferite sa
> "safe" za
> ISA DMA operacii? Ako e taka tova bi mi spestilo dosta glavobolia, a i
> v konkretnia sl. ako pyk ne sa "safe" mai vmesto da spe4elia cpu time i
> po-visoka transferna skorost shte stane to4no obratnoto ako polzvam DMA
> i kopirane ot vyv "bouncing buffers".
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