Date: Thu, 02 Aug 2001 20:35:25 -0400 From: Sergey Babkin <babkin@bellatlantic.net> To: tlambert2@mindspring.com Cc: craig <craiglei@pasia.com.cn>, freebsd-hackers@FreeBSD.ORG Subject: Re: How to visit physical memory above 4G? Message-ID: <3B69F1CD.F8798A3E@bellatlantic.net> References: <002701c11aed$ae1b98a0$051a0a0a@fd.com> <3B68F190.AB04ACB3@mindspring.com>
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Terry Lambert wrote: > > This basically means that the memory is useless as a DMA target > or source for disk controllers or gigabit ethernet cards, and is > pretty useless for swap, if you ever have to copy from one section > to another (e.g. for IPC, SYSV shared memory, mmap'ed files, VM, > or buffer cache, etc.). For the PCI cards supporting the 64-bit addresses you can. (Note that in PCI support of the 64-bit bus is independent of the 64-bit address space, the 64-bit addresses can be multiplexed over a physically 32-bit bus). -SB To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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