Date: Fri, 30 Aug 2002 09:54:16 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Terry Lambert <tlambert2@mindspring.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: More dynamic KVA_SPACE Message-ID: <15727.30984.294448.32315@grasshopper.cs.duke.edu> In-Reply-To: <3D6E91AF.1A09D467@mindspring.com> References: <Pine.OSF.4.30.0208291600300.303-100000@sirppi.helsinki.fi> <3D6E78DA.D1608F0F@mindspring.com> <20020829164416.A67527@locore.ca> <3D6E888B.EC3EAC9F@mindspring.com> <20020829225225.A5665@freebie.xs4all.nl> <3D6E91AF.1A09D467@mindspring.com>
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Terry Lambert writes: > Wilko Bulte wrote: > > > I knew not to recommend the Alpha because it is limited to 2G > > > of physical memory. > > > > ? > > > > FreeBSD is limited to using 2G of whatever you have in the Alpha. > > Which is a deficiency that has been debated a number of times, > > IIRC it needs bus space work etc. See the archives.. > > I know... which is why I didn't recommend it. 8-). Not bus space, busdma! The 2GB limit is due to the lack of MI PCI device driver support for busdma. Especially network drivers, most scsi drivers already do busdma. So as soon as other platforms work with more than the size of their direct map (whatever it happens to be), alpha will too. Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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