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To: Andreas Dilger <adilger@turbolabs.com>
Cc: Michael Peddemors <michael@wizard.ca>, linux-kernel@vger.kernel.org
Subject: Re: Current Max Swap size? Performance issues
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	<20011116163346.L1308@lynx.no>
From: ebiederm@xmission.com (Eric W. Biederman)
Date: 17 Nov 2001 23:28:50 -0700
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Andreas Dilger <adilger@turbolabs.com> writes:

> On Nov 16, 2001  14:02 -0800, Michael Peddemors wrote:
> > With all of the latest VM, again the question is asked...  Best way to
> > set up swap now..
> > 
> > For 2 GIG memory...
> > Channel 0 is RAID 1 SCSI
> > Channel 2 is RAID 1+0 SCSI
> > Hardware Raid
> > 
> > Shoudl it be?
> > 
> > 2 GIG swap partition (Is this still the limit?)
> 
> Yes, still the limit.  It turns out that this is not an on-disk format
> limit, but rather an in-memory structure limit, in case you cared.  For
> non-x86 platforms, there is a different limit.

Where?  The limit should be about 64GB or so on x86.  If it isn't it should
be just a couple of lines to change it.  Or is the limit the vmalloc
of the swap_map?

I skimmed the code a while ago but I haven't had the time to patch mkswap
and actually try it with something larger.


Eric
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