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Re: [Qemu-devel] guest kernel in the host RAM
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] guest kernel in the host RAM |
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Date: |
Tue, 15 Dec 2015 12:59:52 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 |
On 15/12/2015 12:27, Denis V. Lunev wrote:
> The idea is that we could boot with the uncompressed Linux
> kernel in the guest which serves 2 purposes:
> - faster boot time as per Intel opinion
> - memory savings
>
> Uncompressed kernel image could be the same for several
> guests and thus memory pages for the kernel could be the
> same, which saves a bit of RAM :)
>
> At the moment neither BIOS support this in full: nor SeaBIOS,
> nor OVMF, nor QBoot.
>
> From our point of view QBoot is an ideal candidate for this.
QBoot is not meant for use in production; SeaBIOS actually is just as
fast if you configure it right.
> Do you have any opinion for the topic?
I honestly don't like the idea. Linux patches itself a lot, which
makes the memory savings minimal (if they exist at all). What is the
decompression time for a kernel that is compressed with LZO?
Paolo