Message-ID: <F128989C2E99D4119C110002A507409801C52F89@topper.hrow.ndsuk.com>
From: "Elgar, Jeremy" <JElgar@ndsuk.com>
To: linux-kernel@vger.kernel.org
Subject: RE: Swap vs No Swap.
Date: Thu, 22 Nov 2001 16:11:29 -0000
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Sender: linux-kernel-owner@vger.kernel.org

Hum think I'm going to test this idea out tonight, quick question without
swap at what point would the kernel stop giving memory up for cache
purposes. For example I noticed on Tuesday whist doing a back up of a file
system (in-line tar cd untar) I was left with ~4 Mb left having nearly the
rest of my 2Gb Ram used for cache.

Would this ram be given back to the free pool much more readily? 


> -----Original Message-----
> From: war [mailto:war@starband.net]
> Sent: 22 November 2001 16:01
> To: Oliver Neukum; linux-kernel@vger.kernel.org
> Subject: Re: Swap vs No Swap.
> 
> 
> Once again, I have enough ram where I am not going to run out 
> for the things I
> do.
> I never need swap.
> 
> When the system swaps, it slows down the system 
> responsiveness big time.
> 
> 
> Oliver Neukum wrote:
> 
> > Am Donnerstag 22 November 2001 02:53 schrieb war:
> > > I do not understand something.
> > >
> > > How can having swap speed ANYTHING up?
> > >
> > > RAM = 1000MB/s.
> > > DISK = 10MB/s
> > >
> > > Ram is generally 1000x faster than a hard disk.
> > >
> > > No swap = fastest possible solution.
> >
> > At some point you will run out of ram. Then you have to 
> start paging. The
> > only question there is whether you page only mmaped files 
> including program
> > code or whether you also write out program data.
> >
> >         HTH
> >                 Oliver
> 
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