From: Paolo Bonzini <pbonzini@redhat.com>
To: "Denis V. Lunev" <den@openvz.org>
Cc: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>,
QEMU <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] guest kernel in the host RAM
Date: Tue, 15 Dec 2015 12:59:52 +0100 [thread overview]
Message-ID: <567000B8.2070300@redhat.com> (raw)
In-Reply-To: <566FF912.3000809@openvz.org>
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
next prev parent reply other threads:[~2015-12-15 12:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <566EE582.2070408@virtuozzo.com>
2015-12-15 11:27 ` [Qemu-devel] guest kernel in the host RAM Denis V. Lunev
2015-12-15 11:59 ` Paolo Bonzini [this message]
2015-12-18 16:28 ` Denis V. Lunev
2015-12-18 18:03 ` Paolo Bonzini
2015-12-16 3:18 ` Stefan Hajnoczi
2015-12-16 9:56 ` Miao Yan
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