Re: Unbloating the kernel, action list

[Jan-Benedict Glaw]

On Wed, 2003-10-15 20:16:58 +0200, Gabriel Paubert <paubert@xxxxxxx>
wrote in message <20031015181658.GA9652@xxxxxxx>:
> On Wed, Oct 15, 2003 at 06:10:15AM -0700, William Lee Irwin III wrote:
> > On Tue, 2003-10-14 15:56:38 -0700, cliff white <cliffw@xxxxxxxx>
> > Can you quantify the performance impact of cmov emulation (or whatever
> > it is)? I have a vague notion it could be hard given the daunting task
> > of switching userspace around to verify it.
> The other problem of the 386 is that it has a fundamental MMU flaw:
> no write protection on kernel mode accesses to user space, which makes 
> put_user() intrinsically racy on a 386 and way more bloated when it is
> inlined (access_ok has to call a function which searches the VMA tree).

However, this problem exists since the very first hour. Linux once
really ran quite well on those machines...

I've rebooted my P-Classic router last night. Maybe I can see (in two
weeks or in a month or the like...) why it slows down, even with 32MB
RAM...

MfG, JBG

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