Date: Sun, 14 Mar 1999 12:39:25 -0600 From: Tony Overfield <tony@dell.com> To: Sheldon Hearn <sheldonh@iafrica.com>, "Daniel C. Sobral" <dcs@newsguy.com> Cc: hackers@FreeBSD.ORG Subject: Re: Proposal: Define MAXMEM in GENERIC Message-ID: <3.0.6.32.19990314123925.039187c0@bugs.us.dell.com> In-Reply-To: <63209.921431112@axl.noc.iafrica.com> References: <Your message of "Mon, 15 Mar 1999 01:54:46 %2B0900." <36EBE9D6.7E6320FE@newsguy.com>
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>... 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.
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