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Re: 2.4.11-pre2-xfs

To: Seth Mos <knuffie@xxxxxxxxx>
Subject: Re: 2.4.11-pre2-xfs
From: utz lehmann <xfs@xxxxxxxxxx>
Date: Fri, 5 Oct 2001 22:56:50 +0200
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <20011005224034.A21589@xxxxxxxxxx>
References: <3BBE04A0.64D2A0BA@xxxxxxxxxxx> <Pine.BSI.4.10.10110052121220.303-100000@xxxxxxxxxxxxx> <20011005224034.A21589@xxxxxxxxxx>
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utz lehmann [xfs@xxxxxxxxxx] wrote:
> Hi Seth
> 
> Seth Mos [knuffie@xxxxxxxxx] wrote:
> > The dell PE 2500 is ServerWorks LE based, 2GB ram with both 2.4.10 and
> > 2.4.11-pre3.
> > 
> > The only way to fix it is not using HIGHMEM. As soon as I compile without
> > HIGHMEM (4GB) the box is stable and does not deadlock or crash even under
> > heavy load. I have about a month before the system must go into production
> > so if anyone has some hints or tests I could do they are most welcome.
> > 
> > I can not get it over my heart to tell that we cannot use half the
> > memory available. There goes my reputation :-/
> 
> Maybe I have a solution for you (and others).
> 
> I found a patch (linux-2.4.2-vm-1-2-3-gbyte.patch) in the redhat kernel src
> rpm. It allow you to change the standard vm user/kernel split of 3/1 GB to
> 2/2 and 1/3 GB. Without a HIGHMEM kernel your max available memory is kernel
> spilt size - 128MB. 896MB default, and 1920 or 2944MB with the patch.
> 
> At work we have athlon based CAE workstations and numbercruncher with 1GB or
> 1.5GB RAM. They running 2.4.7 or 2.4.9 linux-xfs kernels (of course .-) with
> this patch. I modified the patch to 2.75/1.25 resp. 2.25/1.75GB. So they can
> use all their memory without HIGHMEM.
> 
> Advantages are no performance loss due HIGHMEM and *NO* HIGHMEM trouble.
> 
> Disadvantage is that the possible userspace size per process is reduced.
> If you don't have big processes it won't be a problem. I saw >1GB sized
> processes with the 2.25/1.75GB split.
> 
> 
> hope that helps.
> 
> utz

Please note that I haven't used this patch with 2.4.10. It maybe break
things due the new vm.


utz


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