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Hello friends! |
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On Mon, Oct 2, 2017 at 3:03 PM, Tanstaafl <tanstaafl@×××××××××××.org> wrote: |
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> On 10/2/2017, 2:39:51 PM, Stroller <Stroller@××××××××××××××××××.uk> wrote: |
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>> |
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>>> On 2 Oct 2017, at 18:30, Tanstaafl <tanstaafl@×××××××××××.org> wrote: |
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>>> |
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>>> One thing I do seem to recall is there was somewhere that I had to |
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>>> define Xen as the virtualization environment being used, but I can't |
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>>> remember where I did that. Was that in the kernel config? If so, their |
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>>> tool should (hopefully) handle that change. |
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>> |
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>> See last lines: |
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>> |
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>> ~ $ grep -B 25 -ie xen -ie kvm /etc/rc.conf |
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> <snip> |
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>> # "xen0" - Xen0 Domain (Linux and NetBSD) |
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>> # "xenU" - XenU Domain (Linux and NetBSD) |
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>> ~ $ |
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>> |
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>> This on a Linode host, BTW. They haven't told me I need to do anything, so I hope I'm ok. |
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>> |
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>> HTH, |
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> |
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> Thanks! Yes, at least now I know where that was specified... and since |
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> there is nothing there for kvm, I guess you just leave it commented, BUT... |
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> |
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> yours doesn't appear to be set?? Mine is set to "xenU". |
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> |
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|
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Due to the nature of how both Xen and QEMU/KVM work, there is no need |
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to set any kernel configuration that tells the kernel it is running on |
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virtual hardware. However, if you do so, you will see performance |
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gains. |
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|
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Some of these performance gains are visible outside of the virtualized |
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system so hosting providers would be within their rights to require |
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specific configuration, but I expect they would have made it obvious. |
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|
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Refer to https://wiki.gentoo.org/wiki/QEMU/Linux_guest, but these |
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settings require support from Linode. |
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|
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> So... maybe I've never even needed this? Or maybe I did way back when I |
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> first installed this (probably 7 or 8 years ago), and it isn't needed |
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> any longer? Would the need for it be based on the kernel version? OR the |
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> underlying Xen Host version? Or something else? |
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> |
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> More importantly - I guess I should comment it out right before the |
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> migration? Or is this something I can do after? IF I don't, how would I |
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> handle it? |
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> |
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|
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As long as your kernel has the appropriate drivers (i.e. you didn't |
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include only the virtualized Xen drivers and left most of the default |
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options intact) it should boot under QEMU/KVM or even on a bare metal |
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system. |
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|
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Cheers, |
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R0b0t1 |
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