Date: Sun, 12 Jul 1998 21:33:56 +0200 From: Stefan Eggers <seggers@semyam.dinoco.de> To: freebsd-hackers@FreeBSD.ORG Cc: Jason Thorpe <thorpej@nas.nasa.gov>, seggers@semyam.dinoco.de Subject: Re: Page size flexibility in FreeBSD VM? Message-ID: <199807121933.VAA29373@semyam.dinoco.de> In-Reply-To: Your message of "Sun, 12 Jul 1998 09:42:24 PDT." <199807121642.JAA20283@lestat.nas.nasa.gov>
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> > alpha platform. I would not expect to see any problems with page sizes > > other than 4k/8k, within reason. > > You guys want to run on the UltraSparc, right? The MMU found on that puppy > doesn't really have the notion of "page size" ... (well, sort of; the TLB > is much like the R10000's, in that the reach of a given TLB entry is > configurable per-entry...) So where's the problem. A page is 4k by definition then. ;-) As long as there is something which can act like a MMU with pages of uniform size it's good enough. If we make page sizes other than 4k/8k we will hit some small bugs (one at least - the one I found being the reason I asked) but I don't think there will be many such problems. The VM systems is pretty independent of the actual page sizes used. And the underlaying physical pages don't have to be that size anyway as far as I see. Stefan. -- Stefan Eggers Lu4 yao2 zhi1 ma3 li4, Max-Slevogt-Str. 1 ri4 jiu3 jian4 ren2 xin1. 51109 Koeln Federal Republic of Germany To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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