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Re: [Qemu-devel] SeaBIOS booting time optimization
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] SeaBIOS booting time optimization |
Date: |
Tue, 20 Nov 2018 12:22:03 +0100 |
User-agent: |
NeoMutt/20180716 |
Hi,
> > Background: The drivers in seabios work on both virtual and physical
> > hardware (you can run seabios as coreboot payload on physical hardware).
> > There are quite a few places where are delays and timeouts which are
> > required to work properly on physical hardware. But typically virtual
> > hardware is alot faster. There is -- for example -- no time needed to
> > establish a sata link. Link detection in ahci is instant on qemu.
>
> I'll investigate also other timeouts.
I'd focus on legacy lpc/isa hardware here. PCI-ish hardware which has
such timeouts (sata, usb, ...) typically isn't present in the virtual
machine if you care about performance. Or, in other words, the best way
to handle the sata link detection delay is to use "qemu -M q35,sata=off".
cheers,
Gerd
- Re: [Qemu-devel] SeaBIOS booting time optimization, (continued)
- Re: [Qemu-devel] SeaBIOS booting time optimization, Samuel Ortiz, 2018/11/18
- Re: [Qemu-devel] SeaBIOS booting time optimization, Gerd Hoffmann, 2018/11/19
- Re: [Qemu-devel] SeaBIOS booting time optimization, Stefano Garzarella, 2018/11/19
- Re: [Qemu-devel] SeaBIOS booting time optimization, Stefan Hajnoczi, 2018/11/19
- Re: [Qemu-devel] SeaBIOS booting time optimization, Gerd Hoffmann, 2018/11/19
- Re: [Qemu-devel] SeaBIOS booting time optimization, Stefano Garzarella, 2018/11/19
- Re: [Qemu-devel] SeaBIOS booting time optimization, Gerd Hoffmann, 2018/11/20
- Re: [Qemu-devel] SeaBIOS booting time optimization, Stefano Garzarella, 2018/11/20
- Re: [Qemu-devel] SeaBIOS booting time optimization,
Gerd Hoffmann <=
- Re: [Qemu-devel] SeaBIOS booting time optimization, Stefano Garzarella, 2018/11/22
- Re: [Qemu-devel] SeaBIOS booting time optimization, Gerd Hoffmann, 2018/11/22
- Re: [Qemu-devel] SeaBIOS booting time optimization, Stefano Garzarella, 2018/11/22
- Re: [Qemu-devel] SeaBIOS booting time optimization, Gerd Hoffmann, 2018/11/23
- Re: [Qemu-devel] SeaBIOS booting time optimization, Stefano Garzarella, 2018/11/23
- Re: [Qemu-devel] SeaBIOS booting time optimization, Kevin O'Connor, 2018/11/23
- Re: [Qemu-devel] SeaBIOS booting time optimization, Stefano Garzarella, 2018/11/23
- Re: [Qemu-devel] [SeaBIOS] SeaBIOS booting time optimization, Kevin O'Connor, 2018/11/20
- Re: [Qemu-devel] [SeaBIOS] SeaBIOS booting time optimization, Steve Douthit, 2018/11/20
- Re: [Qemu-devel] [SeaBIOS] SeaBIOS booting time optimization, Stefano Garzarella, 2018/11/20