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From: Brock Palen (brockp_at_[hidden])
Date: 2006-12-12 15:02:09


On Dec 11, 2006, at 4:04 PM, Reese Faucette wrote:

>>> GM: gm_register_memory will be able to lock XXX pages (YYY MBytes)
>> Is there a way to tell GM to pull more memory from the system?
>
> GM reserves all IOMMU space that the OS is willing to give it, so
> what is
> needed is a way to tell the OS and/or machine to allow a bigger
> chunk of
> IOMMU space to be grabbed by GM. Note that IOMMU space is not the
> same as
> the amount of memory a process can used, it is the amount of DMA-
> able memory
> that a driver can have "registered" at any one time. MPI then has
> to manage
> this space much like a VMM has to manage physical memory vs. page
> space.
> -reese
Well I have no luck in finding a way to up the amount the system will
allow GM to use. What is a recommended solution? Is this even a
problem in most cases? Like am i encountering a corner case?

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