Re: A scrub daemon (prezeroing)

[Christoph Lameter]

On Wed, 2 Feb 2005, Marcelo Tosatti wrote:

> > Nope the BTE is a block transfer engine. Its an inter numa node DMA thing
> > that is being abused to zero blocks.
> Ah, OK.
> Is there a driver for normal BTE operation or is not kernel-controlled ?

There is a function bte_copy in the ia64 arch. See

arch/ia64/sn/kernel/bte.c

> I wonder what has to be done to have active DMA engines be abused for zeroing
> when idle and what are the implications of that. Some kind of notification mechanism
> is necessary to inform idleness ?
>
> Someone should try implementing the zeroing driver for a fast x86 PCI device. :)

Sure but I am on ia64 not i386. Find your own means to abuse your own
chips ... ;-)
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