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Path: sserve!newshost.anu.edu.au!munnari.oz.au!spool.mu.edu!howland.reston.ans.net!agate!news.Brown.EDU!noc.near.net!news.delphi.com!usenet From: John Dyson <dysonj@delphi.com> Newsgroups: comp.os.386bsd.questions Subject: Re: FreeBSD died on P560 with 32megs ram Date: Tue, 22 Mar 94 21:55:26 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 19 Message-ID: <h60PYn2.dysonj@delphi.com> References: <1994Mar17.095541.29513@paramount.nikhefk.nikhef.nl> <MARK.876.2D87ACA4@ardsley.business.uwo.ca> <2mlb4o$sfh@news.ysu.edu> <ZQ+sgD2.dysonj@delphi.com> NNTP-Posting-Host: bos1a.delphi.com X-To: John Dyson <dysonj@delphi.com> John Dyson <dysonj@delphi.com> writes: >I don't think that *BSD has any support for ISA & bus mastering DMA > 16MB >yet. FreeBSD will probably have it in V1.2. It is curious that >386BSD 0.1 works > 16MB, maybe the buffers were all pre-allocated at >startup (I think that NetBSD does this) and he just did not happen to >use the swap-pager above 16MB??? Okay, everyone in the FreeBSD group (at least it seems) ended up beating me up. I have a copy of the new FreeBSD bounce-buffering code in David Greenman's hands (just wrote it.) It only handles scatter-gather right now, but is architecturally consistant with large contiguous memory requirements. It appears to work with both SCSI tape, and wd disk.... I know, I know, wd doesn't need it, but it is the only disk that I could test it on. The might make it into 1.1 but the only way that it will is if the tests go VERY VERY well... Phew... Lots of hard, fast work... John dyson@implode.root.com