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mreff555
Apprentice
Joined: 10 Mar 2011
Posts: 231
Location: Philadelphia
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 Posted: Sun Dec 01, 2013 3:08 pm Post subject: Config_zone_dma |
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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:
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│ 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
Bodhisattva
Joined: 19 Oct 2007
Posts: 2537
Location: Hilbert space
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| Posted: Sun Dec 01, 2013 4:19 pm Post subject: Re: Config_zone_dma |
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| mreff555 wrote: | | Does a modern x86_64 system have many devices with less than 32 bet addressing? |
Certainly not many!
My 2009 (modern motherboard...  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
Apprentice
Joined: 10 Mar 2011
Posts: 231
Location: Philadelphia
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| Posted: Mon Dec 02, 2013 4:22 pm Post subject: |
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| 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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