Messages in this thread |  | | Date | Mon, 25 Sep 2000 22:03:01 +0300 | From | Matti Aarnio <> | Subject | Re: the new VMt [4MB+ blocks] |
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[Chopped the recipient list radically]
On Mon, Sep 25, 2000 at 06:06:11PM +0100, Alan Cox wrote: > > > > Stupidity has no limits... > > > Unfortunately its frequently wired into the hardware to save a few cents on > > > scatter gather logic. > > > > Since when hardware folks became exempt from the rule above? 128K is > > almost tolerable, there were requests for 64 _mega_bytes... > > Most cheap ass PCI hardware is built on the basis you can do linear 4Mb > allocations. There is a reason for this. You can do that 4Mb allocation on > NT or Windows 9x
Sure, but intel processors have this neat 4 MB "super-page" feature in the MMU... (as we all well know)
Sometimes allocating such monster memory blocks could be supported, but it should not be expected to be *fast*. E.g. if doing it in "reliable" way needs possibly moving currently allocated pages away from memory to create such a hole(s), so be it..
Anybody here who can describe those M$ API calls ? Are they kernel/DDK-only, or userspace ones, or both ?
/Matti Aarnio - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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