Date: Sat, 6 Jul 2002 01:10:33 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Darren Pilgrim <dmp@pantherdragon.org> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: How does swap work address spacewise? Message-ID: <200207060810.g668AXHF017676@apollo.backplane.com> References: <20020705113532.GA11273@atrbg11.informatik.tu-muenchen.de> <20020705133515.GA295@HAL9000.wox.org> <20020705133837.GA513@HAL9000.wox.org> <20020705234126.GA12183@atrbg11.informatik.tu-muenchen.de> <3D2640A7.3EA2236B@pantherdragon.org>
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:If RAM + swap can be more than 4GB, how does FreeBSD address swap on a
:32-bit machine? Does the kernel internally use a wider address space
:with some kind of translation to 32-bit space for programs and hardware
:that can't handle 64-bit addresses or does it not map swap into the
:address space at all, instead using it as a kind of "offline" storage
:for pages not in use? Does the Alpha port handle swap the same way?
:
The 4GB limitation only applies to memory addresses. Block devices
and files have no such limitation ... 'off_t' has been 64 bits for many
years. You can create filesystems and files up to 2TB in size in -stable
and it will be virtually unlimited in -current.
-Matt
Matthew Dillon
<dillon@backplane.com>
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