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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=567000B8.2070300@redhat.com \
--to=pbonzini@redhat.com \
--cc=den@openvz.org \
--cc=qemu-devel@nongnu.org \
--cc=vsementsov@virtuozzo.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).