From: Vasu Varma P V <pvvvarma@techmas.hcltech.com>
To: arjanv@redhat.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: DMA memory limitation?
Date: Thu, 05 Jul 2001 18:07:57 +0530 [thread overview]
Message-ID: <3B445FA5.8CB55F45@techmas.hcltech.com> (raw)
In-Reply-To: <3B4453E6.F4342781@techmas.hcltech.com> <3B44558A.B52B5C60@redhat.com>
but we have a macro in include/asm-i386/dma.h,
MAX_DMA_ADDRESS (PAGE_OFFSET+0x1000000).
if i change it to a higher value, i am able to get more dma
memory. Is there any way i can change this without compiling
the kernel?
Arjan van de Ven wrote:
> Vasu Varma P V wrote:
> >
> > Hi,
> >
> > Is there any limitation on DMA memory we can allocate using
> > kmalloc(size, GFP_DMA)? I am not able to acquire more than
> > 14MB of the mem using this on my PCI SMP box with 256MB ram.
> > I think there is restriction on ISA boards of 16MB.
> > Can we increase it ?
>
> Why?
> YOu don't have to allocate GFP_DMA memory for PCI cards!
> GFP_DMA is for ISA cards only
next prev parent reply other threads:[~2001-07-05 12:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-05 11:47 Vasu Varma P V
2001-07-05 11:53 ` Alan Cox
2001-07-05 11:54 ` Arjan van de Ven
2001-07-05 12:37 ` Vasu Varma P V [this message]
2001-07-05 12:37 ` Richard B. Johnson
2001-07-05 17:07 ` Christophe Beaumont
2001-07-05 17:19 ` Richard B. Johnson
2001-07-06 8:59 ` Helge Hafting
2001-07-06 9:44 ` Steffen Persvold
2001-07-06 11:08 ` Alan Cox
2001-07-06 11:27 ` Jeff Garzik
2001-07-06 15:16 ` Steffen Persvold
2001-07-06 15:39 ` Jeff Garzik
2001-07-06 15:48 ` Alan Cox
2001-07-06 15:56 Matt_Domsch
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