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Date:      Fri, 13 Jul 2001 18:37:48 -0400
From:      David Gilbert <dgilbert@velocet.ca>
To:        Matt Dillon <dillon@earth.backplane.com>
Cc:        David Gilbert <dgilbert@velocet.ca>, Thierry Herbelot <thierry@herbelot.com>, Alfred Perlstein <bright@sneakerz.org>, hackers@FreeBSD.ORG
Subject:   Re: Swapping in diskless ? (was :Re: [hackers] Re: getting rid of  sysinstall)
Message-ID:  <15183.30780.779907.874814@trooper.velocet.net>
In-Reply-To: <200107132227.f6DMR8071313@earth.backplane.com>
References:  <bulk.72438.20010711142307@hub.freebsd.org> <Pine.BSF.4.21.0107121211060.35209-100000@www.bloodletting.com> <20010712143205.D4589@sneakerz.org> <3B4E1C69.A6DC0397@herbelot.com> <15182.63564.476492.390695@trooper.velocet.net> <3B4F3A22.EF2AC90A@herbelot.com> <15183.17942.995110.382797@trooper.velocet.net> <200107132227.f6DMR8071313@earth.backplane.com>

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>>>>> "Matt" == Matt Dillon <dillon@earth.backplane.com> writes:

Matt>     Right, you only need swap to be able to flush dirty pages.
Matt> Clean code (and even clean data) pages are simply dropped and
Matt> reloaded from the disk image later on if needed again.  With
Matt> careful program management you can run without swap.

Matt>     Also, do performance testing with dynamic-linked verses
Matt> static-linked binaries.  Static-linked binaries may look larger,
Matt> but they have a much lower dirty-page overhead then the
Matt> dynamically linked equivalent.  It depends on the situation but
Matt> it is definitely worth testing.

Is it not possible (or has nobody done it) to swap with the current
diskless boot?  Of all people, I would have expected Matt to be able
to help :).

I have quite a few systems netbooting using etherboot floppies
(incidentally running 3.4) ... and they use NFS swap just fine.  I
would really like the same thing with the PXE boot.

Is it possibly as simple as making pxeboot ignore the swap DHCP tag?
Does anyone here hack pxeboot?

Dave.

-- 
============================================================================
|David Gilbert, Velocet Communications.       | Two things can only be     |
|Mail:       dgilbert@velocet.net             |  equal if and only if they |
|http://www.velocet.net/~dgilbert             |   are precisely opposite.  |
=========================================================GLO================

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