Re: [gentoo-dev] rfc: locations of binaries and separate /usr

[Michał Górny]

On Fri, 6 Jan 2012 19:41:39 -0500
"Walter Dnes" <waltdnes@××××××××.org> wrote:

>   In my 3 gig /usr directory, over 2 gigs are devoted to
> Gentoo-specific stuff that a binary distro like Redhat does not
> require.  What do we do if /usr is read-only?  Symlink or bindmount
> onto it?

Remount read/write whenever necessary (i.e. when doing administrative
tasks).

>   And sharing binaries does *NOT* work in Gentoo, unless *EVERYBODY*
> has *IDENTICAL* machines, or else you drop down to the lowest common
> denominator.  That's one of the main points about Gentoo.  We don't
> use generic i686 code, we use code optimised for our machines.  I'm
> not a "Gentoo ricer", but here's a prime example... a 3 and 1/2 year
> old Dell Dimension 530 with an onboard Intel graphics chip.  Right
> after the initial install (i686 code from the install CD), the
> onboard graphics could not handle NHL Gamecentre Live fullscreen
> (1920x1080).  There would be constant stuttering.  After I emerged
> system and world with "-march=native -O2 -mfpmath=sse", it handles
> NHL Gamecentre Live fullscreen, and even a 1080p movie clip
> downloaded from Youtube.  Fedora with generic i686 code would not
> work for me.

Sharing is usually useful when everybody actually has identical
machines. Also, there's '-mtune' switch in gcc.

-- 
Best regards,
Michał Górny