Re: Memory allocation in Linux (fwd)

["Amit S. Jain" <amitjain@tifr.res.in>]

You cannot pass address returned from vmalloc to hardware: vmalloc returns
> a virtual mapping of memory.
>
>               -ben


 Thanks Ben,

So wass the solution for this.....??

Thanks
Amit 



On Thu, 11 Apr 2002, Benjamin LaHaise wrote:

> On Thu, Apr 11, 2002 at 06:16:56PM +0530, Amit S. Jain wrote:
> > Hi everyone,
> >             This is a continuation of the mail I had written earlier (see
> > down)tellin bout my problem that when i use vmalloc()...I get an error stating
> >  "PCI bus error 2290".I think i have a slight idea what the problem could
> > be.....Hope u all could comment on it.
> > The large amount of memory i obtain using vmalloc is then pointed to by
> > the skb "network" buffers as i copy data into this memory which has to be
> > transmitted.Since the memory is discontinuous implying data is
> > discontinuous and the ethernet card I am using is REALTEK8139 which
> > doesnot support SCATTER/GATHER DMA.... hence the PCI bus cant find the
> > continuous data which has to be transmitted.
> 
> You cannot pass address returned from vmalloc to hardware: vmalloc returns 
> a virtual mapping of memory.
> 
> 		-ben
> 

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