I486_CPU or I586_CPU in kernel config

Adam Vande More amvandemore at gmail.com
Mon May 30 20:47:59 UTC 2011

On Mon, May 30, 2011 at 3:35 PM, Adam Vande More <amvandemore at gmail.com>wrote:

> On Mon, May 30, 2011 at 9:50 AM, Warren Block <wblock at wonkity.com> wrote:
>> Some time back, there was a post on one of the mailing lists that
>> suggested it was better to leave either I486_CPU or I586_CPU enabled in a
>> kernel config even for much newer processors.  For performance reasons,
>> AFAIR.  Naturally I didn't save that post or a link to it.
>> Can anyone find that message, or explain why it would be good to keep
>> either of those cpu options in a kernel that will only run on much newer
>> CPUs?
> Um, I don't recall seeing that and have removed them automatically for a
> long time.  Here is one that suggests keeping I586_CPU with results that
> seem less than conclusive.
> http://lists.freebsd.org/pipermail/freebsd-stable/2005-December/020702.html

Perhaps this is the one you meant?


Actually the two threads touch on the same subject, and it seems removal of
those options is still desirable on newer CPU's.

Adam Vande More

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