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Re: RAM/memory cacheable by linux kernel/host CPU ?

To: "yogeshwar sonawane" <yogyas@xxxxxxxxx>
Subject: Re: RAM/memory cacheable by linux kernel/host CPU ?
From: "Mulyadi Santosa" <mulyadi.santosa@xxxxxxxxx>
Date: Mon, 6 Oct 2008 21:53:58 +0700
Cc: kernelnewbies@xxxxxxxxxxxx
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On Fri, Oct 3, 2008 at 2:04 PM, yogeshwar sonawane <yogyas@xxxxxxxxx> wrote:
> Hi all,
>

> By default, all memory/RAM is cacheable by linux kernel /host CPU ?

I think yes, but you can always change this behaviour.

> What is the scenario with other OSes ?

I think other OSes behave the same: caching is preferred all the time
unless it is needed otherwise.

> If RAM is cacheable, then the memory-mapped IO regions of the
> peripherals are also cacheable ?

IMO no, caching it in RAM could introduce unwanted behaviour: data is
expected to be written to a device while in fact it's still cached.

regards,

Mulyadi.

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References:
- RAM/memory cacheable by linux kernel/host CPU ?
  - From: yogeshwar sonawane

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