Date: Thu, 08 Feb 2018 17:49:06 +0000 From: Frank Leonhardt <frank2@fjl.co.uk> To: freebsd-questions@freebsd.org Subject: Re: Swap on SSD Message-ID: <8881bd8b8006cb246d6ef566e2a277fa@roundcube.fjl.org.uk> In-Reply-To: <slrnp7mldb.66b.naddy@lorvorc.mips.inka.de> References: <alpine.OSX.2.21.1802051507540.42615@ary.qy> <de600d709ef24c7b65f22963d72040e6@roundcube.fjl.org.uk> <slrnp7mldb.66b.naddy@lorvorc.mips.inka.de>
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On 2018-02-07 19:38, Christian Weisgerber wrote: > On 2018-02-07, Frank Leonhardt <frank2@fjl.co.uk> wrote: > >> There seems to be some confusion on this list about swapping and >> paging. >> Swapping is old hat. Basically when doing a context swap you wrote a >> non-running process to a swap area to free up RAM space. We don't do >> that anymore - we use demand paged virtual memory. > > Demand paging was introduced in UNIX 32V and entered the BSD line > with 3BSD. That's around 1978-80, so almost forty years ago. Yeah, but not everyone could afford an MMU until much later :-) Did you ever run the UCSD P System? For some reason the keyboard driver got swapped out (on to 8" Floppy) and every time you hit the keyboard the drive went <CLUNK>.
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