Is there concept of large pages on Vista?

Hi,

Is there a concept of large pages on Vista?
What is the maximum size of contiguous physical memory that is possible to
allocate from an app on Vista and above?
I would like to write an app that allocate a huge contiguous physical
memory and fill it with data and pass it down to
network driver for xmitting (for test purposes)?
Is there a call available that I can use from within my app. The app is
written in C.

Regards,
-Praveen

 

How much is "huge contiguous physical memory"? How is your network card
moving the data from host memory to the card? I mean, is it DMA with a
common buffer (a big common buffer) or rather scatter-gather DMA?

Have a nice day
GV

 

Yes- VirtualAlloc with MEM_LARGE_PAGES. However, that doesn't guarantee
larger than the large page size as physically contiguous - e.g. if you take
more than one page, they need not be physically contiguous

BTW, directly sharing memory between a driver and a user mode app is almost
always the wrong way to go. Use the inverted call model with overlapped
pended IOCTLs instead.

 

You cannot allocate physical memory from the app in any Windows version.