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mreff555
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PostPosted: Sun Dec 01, 2013 3:08 pm    Post subject: Config_zone_dma Reply with quote

I was reading through some of the descriptions of options in my kernel. when I came across CONFIG_ZONE_DMA. the description is as follows:
Code:

│ DMA memory allocation support allows devices with less than 32-bit        │ 
  │ addressing to allocate within the first 16MB of address space.            │ 
  │ Disable if no such devices will be used.


Does a modern x86_64 system have many devices with less than 32 bet addressing?
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aCOSwt
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PostPosted: Sun Dec 01, 2013 4:19 pm    Post subject: Re: Config_zone_dma Reply with quote

mreff555 wrote:
Does a modern x86_64 system have many devices with less than 32 bet addressing?

Certainly not many!
My 2009 (modern motherboard... :lol: used to be modern...) still offers a connector for a floppy drive and a parallel port capable of using dma.
I think that most parallel ports are still implemented on a (pseudo)ISA bus and therefore, can use dma32.
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mreff555
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PostPosted: Mon Dec 02, 2013 4:22 pm    Post subject: Reply with quote

Well since this is a laptop, circa 2009 it does not have a parallel port. So I think you have successfully answered my question. There is probably no need to keep this enabled.
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