Date: Wed, 26 Jan 2005 03:35:46 +0200 (EET) From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: "Andrew L. Gould" <algould@datawok.com> Cc: freebsd-questions@freebsd.org Subject: Re: kernel info question Message-ID: <20050126033019.H6660@gothmog> In-Reply-To: <200501251908.59477.algould@datawok.com> References: <200501251625.30486.algould@datawok.com> <200501251715.06864.algould@datawok.com> <200501251908.59477.algould@datawok.com>
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On 2005-01-25 19:08, Andrew L. Gould wrote: > On Tuesday 25 January 2005 05:32 pm, Giorgos Keramidas wrote: >> On 2005-01-25 17:15, "Andrew L. Gould" <algould@datawok.com> wrote: >>> I'm selecting CPU types in the kernel configuration file, which >>> lists only i386, i486, i586 and i686. >> >> AFAIK, and I may be a bit wrong here, if you don't really expect to >> move disks around and actually run this kernel on a 486-class >> machine, leaving both i586 and i686 won't do any harm. > > Under normal circumstances, I believe you're correct. In fact the > GENERIC kernel has all 4 CPU options un-commented. > > This machine is old and fussy; so I'm trying to trim where I can. This particular optimization (both i586 and i686 vs. only one of the two) will not save much (at most a few KB of kernel size), so it won't give particularly impressive results. The i386 support (which has been dropped in some time during the 5.X development IIRC), *does* have a measurable impact on performance though. This is why I suggested that with both i586 and i686 you should be pretty safe :-) There are other things you can trim, mostly in userland, that may have a larger impact on the hardware requirements of the base system. It would require a complete description of the system from a hardware perspective to decide what matters a lot and choose optimizations that may help. > Efforts to install Win98SE, and 3 distros of Linux ended in failure. That may be a result of other factors. Not kernel size. At least not so much.
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