Re: Unbloating the kernel, action list
From: Jan-Benedict Glaw (jbglaw_at_lug-owl.de)
Date: 10/16/03
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Date: Thu, 16 Oct 2003 07:19:51 +0200 To: linux-kernel@vger.kernel.org
On Wed, 2003-10-15 20:16:58 +0200, Gabriel Paubert <paubert@iram.es>
wrote in message <20031015181658.GA9652@iram.es>:
> 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@osdl.org>
> > 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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Jan-Benedict Glaw jbglaw@lug-owl.de . +49-172-7608481
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