Date: Sun, 14 Mar 1999 13:20:44 -0600 (CST) From: Jonathan Lemon <jlemon@americantv.com> To: tony@dell.com, freebsd-hackers@freebsd.org Subject: Re: Proposal: Define MAXMEM in GENERIC Message-ID: <199903141920.NAA16212@free.pcs> In-Reply-To: <local.mail.freebsd-hackers/3.0.6.32.19990314123925.039187c0@bugs.us.dell.com> References: <local.mail.freebsd-hackers/Your message of "Mon, 15 Mar 1999 01:54:46 %2B0900." <local.mail.freebsd-hackers/36EBE9D6.7E6320FE@newsguy.com> <local.mail.freebsd-hackers/63209.921431112@axl.noc.iafrica.com>
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In article <local.mail.freebsd-hackers/3.0.6.32.19990314123925.039187c0@bugs.us.dell.com> you write: >>... since we're >>likely to see more and more people having problems related to failed >>speculative memory probes as >64MB machines become entry-level. > >Since all(*) new machines support INT 15h AX=E820h, and FreeBSD now >seems to be able to use it, why not have the speculative probe >default to disabled in GENERIC and use a boot option to enable probing >support for those very few older systems that supported more than 64MB >or 16MB but did _not_ yet support E820h (or E801h)? > >(*) Good bet if the machine supports MS-Windows. > >p.s. FreeBSD seems to prefer E801h over E820h. I'd like to see it > the other way around, since you could gain almost 64 KB of > extra memory in some cases. Not true, if you're referring to the VM86 memory probe. It tries INT 15h, AX=E820, then INT 15h, AX=E801, then INT 15h, AX=88, in that order. How about making VM86 a mandatory option? -- Jonathan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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