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[Xen-devel] Re: [PATCH] xen: core dom0 support

To: Andi Kleen <andi@xxxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH] xen: core dom0 support
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Sun, 01 Mar 2009 15:38:37 -0800
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
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Andi Kleen wrote:
Jody Belka <lists-xen@xxxxxxxx> writes:
Is it duplication though? I personally have machines with older processors
that don't have hvm support. I plan on keeping these around for a good amount
of time, and would love to be running them on mainline. So for me, unless KVM
is somehow going to support para-virtualisation, this isn't duplication.

The old systems will continue to run fine with a 2.6.18 Dom0 though.

But that suggests the *only* reason to update kernels is to get new hardware support. Or conversely, we should stop trying to be backwards compatible with old hardware in new kernels because there's no reason to keep it.

While a lot of the delta between 2.6.18 has been hardware support updates, there have been a lot of other useful things: a new CPU scheduler, tickless operation (which directly important for virtualization), all the cgroups stuff, new filesystems, IO schedulers, etc, etc. All good things to have, even on older hardware.

   J

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