Date: Sun, 7 Mar 2004 18:24:07 +0100
From: Andrea Arcangeli <andrea@suse.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zaitsev <peter@mysql.com>, Andrew Morton <akpm@osdl.org>,
       riel@redhat.com, mbligh@aracnet.com, linux-kernel@vger.kernel.org
Subject: Re: 2.4.23aa2 (bugfixes and important VM improvements for the high end)
Message-ID: <20040307172407.GA4922@dualathlon.random>
References: <1078370073.3403.759.camel@abyss.local> <20040303193343.52226603.akpm@osdl.org> <1078371876.3403.810.camel@abyss.local> <20040305103308.GA5092@elte.hu> <20040305141504.GY4922@dualathlon.random> <20040305143210.GA11897@elte.hu> <20040305145837.GZ4922@dualathlon.random> <20040305152622.GA14375@elte.hu> <20040305155317.GC4922@dualathlon.random> <20040307084120.GB17629@elte.hu>
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On Sun, Mar 07, 2004 at 09:41:20AM +0100, Ingo Molnar wrote:
> 
> * Andrea Arcangeli <andrea@suse.de> wrote:
> 
> > [...] but I'm quite confortable to say that up to 16G (included) 4:4
> > is worthless unless you've to deal with the rmap waste IMHO. [...]
> 
> i've seen workloads on 8G RAM systems that easily filled up the ~800 MB
> lowmem zone. (it had to do with many files and having them as a big

was that a kernel with rmap or w/o rmap?

> but i'm quite strongly convinced that 'getting rid' of the 'pte chain
> overhead' in favor of questionable lowmem space gains for a dying
> (high-end server) platform is very shortsighted. [getting rid of them
> for purposes of the 64-bit platforms could be OK, but the argumentation
> isnt that strong there i think.]

disagree, the reason I'm doing it is for the 64bit platforms, I can't
care less about x86. the vm is dogslow with rmap.
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