From: Paolo Bonzini <pbonzini@redhat.com>
To: "Richard W.M. Jones" <rjones@redhat.com>
Cc: marc.mari.barcelo@gmail.com, Stefan Hajnoczi <stefanha@gmail.com>,
Kevin O'Connor <kevin@koconnor.net>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Why is SeaBIOS used with -kernel?
Date: Fri, 1 Apr 2016 10:47:21 +0200 [thread overview]
Message-ID: <56FE3599.3010401@redhat.com> (raw)
In-Reply-To: <20160401084456.GF32728@redhat.com>
On 01/04/2016 10:44, Richard W.M. Jones wrote:
> On Fri, Apr 01, 2016 at 10:24:37AM +0200, Paolo Bonzini wrote:
>> On 01/04/2016 10:14, Richard W.M. Jones wrote:
>>> Found it: only CONFIG_MPTABLE=y was necessary. It boots with:
>>>
>>> # CONFIG_PIRTABLE is not set
>>> CONFIG_MPTABLE=y
>>> # CONFIG_SMBIOS is not set
>>> # CONFIG_ACPI is not set
>>
>> If you add all three it should not give any slowdown and will provide
>> full hardware features to the kernel. qboot does ACPI and PCI bus
>> assignment (it doesn't do SMBIOS because I got bored debugging it. :))
>
> Enabling all 4 adds about 2ms.
>
> However the overhead of SeaBIOS is still down from 68ms to 18ms
> (4.0% of total boot time down to 1.1%) so it's still a big gain.
>
> I wonder how we can make use of this in qemu and downstream distros?
> Can we have a bios-min.bin which is used with -kernel boots?
That's an interesting idea. We can look at it for 2.7.
Paolo
next prev parent reply other threads:[~2016-04-01 8:47 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-19 20:31 [Qemu-devel] Why is SeaBIOS used with -kernel? Richard W.M. Jones
2016-03-21 7:58 ` Gerd Hoffmann
2016-03-21 8:37 ` Richard W.M. Jones
2016-03-21 9:40 ` Gerd Hoffmann
2016-03-31 9:21 ` Stefan Hajnoczi
2016-03-31 16:22 ` Kevin O'Connor
[not found] ` <20160331221039.GA32728@redhat.com>
2016-03-31 22:17 ` Richard W.M. Jones
2016-03-31 22:44 ` Kevin O'Connor
2016-04-01 7:55 ` Richard W.M. Jones
2016-04-01 8:03 ` Paolo Bonzini
2016-04-01 8:47 ` Richard W.M. Jones
2016-04-01 8:51 ` Paolo Bonzini
2016-04-01 8:57 ` Richard W.M. Jones
2016-04-01 9:05 ` Paolo Bonzini
2016-04-01 8:02 ` Richard W.M. Jones
2016-04-01 8:11 ` Paolo Bonzini
2016-04-01 8:14 ` Richard W.M. Jones
2016-04-01 8:24 ` Paolo Bonzini
2016-04-01 8:44 ` Richard W.M. Jones
2016-04-01 8:47 ` Paolo Bonzini [this message]
2016-04-01 8:49 ` Vasiliy Tolstov
2016-04-01 9:16 ` Dr. David Alan Gilbert
2016-04-01 9:18 ` Gerd Hoffmann
2016-04-01 10:17 ` Richard W.M. Jones
2016-04-01 11:07 ` Gerd Hoffmann
2016-04-01 11:11 ` Richard W.M. Jones
2016-04-01 11:20 ` Richard W.M. Jones
2016-04-01 11:21 ` Paolo Bonzini
2016-04-01 11:26 ` Richard W.M. Jones
2016-04-05 4:38 ` Kevin Wolf
2016-04-05 8:04 ` Richard W.M. Jones
2016-04-05 8:11 ` Kevin Wolf
2016-04-05 9:19 ` Richard W.M. Jones
2016-04-05 9:26 ` Kevin Wolf
2016-04-01 11:32 ` Gerd Hoffmann
2016-04-01 11:49 ` Richard W.M. Jones
2016-04-01 15:35 ` Kevin O'Connor
2016-04-01 16:03 ` Paolo Bonzini
2016-04-01 18:41 ` Richard W.M. Jones
2016-04-01 18:59 ` Richard W.M. Jones
2016-04-01 19:04 ` Kevin O'Connor
2016-04-01 19:10 ` Richard W.M. Jones
2016-04-01 19:15 ` Richard W.M. Jones
2016-04-01 19:44 ` Kevin O'Connor
2016-04-01 20:25 ` Richard W.M. Jones
2016-04-01 20:05 ` Kevin O'Connor
2016-04-01 20:46 ` Richard W.M. Jones
2016-04-01 22:25 ` Kevin O'Connor
2016-04-02 7:51 ` Richard W.M. Jones
2016-04-02 5:30 ` Paolo Bonzini
2016-04-01 15:08 ` Kevin O'Connor
2016-04-01 14:58 ` Kevin O'Connor
2016-04-01 15:06 ` Richard W.M. Jones
2016-04-01 15:14 ` Kevin O'Connor
2016-04-01 8:19 ` Richard W.M. Jones
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