Date: Sat, 15 Mar 2003 08:48:04 -0600 (CST) From: Mark Tinguely <tinguely@casselton.net> To: andykinney@advantagecom.net Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: increasing KVA_PAGES and broken pthreads Message-ID: <200303151448.h2FEm4Mt089695@casselton.net> In-Reply-To: <Pine.BSF.4.21.0303141709400.44309-100000@InterJet.elischer.org>
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Intel x86 hardware allows windows of 4GB of virtual memory even if you have the PSE-36 and the PAE extensions with more the 4GB of physical memory. Sound a little like Intel's 64KB windows, but if I remember correctly, the 4GB does not have to be contiguous. It would require a true MMU such as those in the 64 bit architectures (AMD opteron, Intel ia64, sparc64) to simulataneously be able to use more than 4GB of RAM. So far the thought it is better to go with a true 64 MMU than take and get a flat address space than take the performance hit (, plus the memory loss for the much larger page table without much benefit) than try to shuffle in the 4GB windows. Check the thread on this topic in the archives. --Mark Tinguely. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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