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Cc: src-committers@FreeBSD.org, jhb@FreeBSD.org, Bruce Evans <bde@zeta.org.au>,
	cvs-src@FreeBSD.org, cvs-all@FreeBSD.org,
	Matthew Jacob <mj@feral.com>, Warner Losh <imp@bsdimp.com>
Subject: Re: cvs commit: src/sys/dev/bce if_bcereg.h
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>> 
>> I'm afraid I don't understand the 'unreasonable' argument here. Linux is 
>> eating your lunch today. Do you want it to eat your dessert as well?
>> 
>> -matt
>> 
>
> bus_size_t is used for things like measuring transfer segment size. There is 
> little chance that Linux, Windows, FreeBSD, or any other OS
> is ever going to try to DMA more than 2^32 bytes of data in a single
> bus transaction.  Maybe you could contrive a silly infiniband device
> to do it.  Anyways, it has no bearing on whether the CPU, memory
> controller, or PCI buses can do 64 bit addressing.

Oh, sorry, yes, I agree it's *unlikely* that anything will DMA more than 
2^32 bytes at a time right now. I'm really really tired and lost lock. 
Sorry.