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- From: mrex@indigo0 (Martin Rex)
- Subject: Q: 20 MB RAM + Adaptec: Ramdisk to swap ?
- Message-ID: <1992Dec16.004630.6793@sun0.urz.uni-heidelberg.de>
- Sender: news@sun0.urz.uni-heidelberg.de (NetNews)
- Reply-To: mrex@aix01.rz.fht-mannheim.de
- Organization: University of Heidelberg, Germany
- X-Newsreader: TIN [version 1.1 PL6]
- Date: Wed, 16 Dec 92 00:46:30 GMT
- Lines: 27
-
- I have 20 MB Ram in my 486/33 and an Adaptec 1542 with an SCSI drive.
- Therefore I have the #define in the kernel not to use more than
- 16 MB of RAM, because of the DMA.
-
- Is it possible to put a ramdisk in the last unused 4 MB and mount it
- as swap-space ? Even with my 16 MBytes sometimes my system has to
- do heavy swapping. (Gcc compiling xphoon or libtiff (xv-2.21),
- Interviews' doc when opening one big or several documents, ImageMagick
- when doubling a 1000x600x24bit picture ... ;-)
-
- If it is possible, how can it be done?
-
- Naturally I would prefer if I could use all memory for Linux,
- but as I understand the current scsi-drivers don't have provisions
- to handle i/o from memory above the ISA-Bus adress space by
- copying it through buffers. This kind of double-buffering would
- surely be slower than direct DMA, but I assume it would still be
- somewhat faster than paging programs in and out when more memory
- is needed.
-
- -Martin
- --
- Martin Rex
- Rechenzentrum
- Fachhochschule fuer Technik Mannheim
- E-Mail: mrex@aix01.rz.fht-mannheim.de
-
-