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Re: [Qemu-devel] [PATCH] qemu:cpuid: speedup test by 3x times if grub2 i
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-devel] [PATCH] qemu:cpuid: speedup test by 3x times if grub2 is available |
Date: |
Thu, 14 Feb 2013 20:28:03 +0100 |
On Thu, 14 Feb 2013 13:13:18 +0100
Paolo Bonzini <address@hidden> wrote:
> Il 14/02/2013 12:18, Eduardo Habkost ha scritto:
> >> > qemu boots from disk image 3 times faster than direct kernel load.
> > That's surprising. Do you have any idea why that happens?
>
> Because kernel load uses MMIO (from fw_cfg), while booting from disk
> uses at worst PCI DMA and at best virtio.
>
> Paolo
I've tried Paolo's suggestion to run in TCG mode with instruction logging,
and it spends too much time reading 11K kernel from qemu compared to
kvm-unit-test kernel. I'll need debug it further to find out why.
But this patch looks unnecessary if I could fix qemu/seabios or test kernel
to reach the same load time as kvm-unit-test kernel.
--
Regards,
Igor
Re: [Qemu-devel] [PATCH] qemu:cpuid: speedup test by 3x times if grub2 is available, Igor Mammedov, 2013/02/14
- Re: [Qemu-devel] [PATCH] qemu:cpuid: speedup test by 3x times if grub2 is available, Eduardo Habkost, 2013/02/14
- Re: [Qemu-devel] [PATCH] qemu:cpuid: speedup test by 3x times if grub2 is available, Lucas Meneghel Rodrigues, 2013/02/14
- Re: [Qemu-devel] [virt-tools-list] [PATCH] qemu:cpuid: speedup test by 3x times if grub2 is available, Richard W.M. Jones, 2013/02/14
- Re: [Qemu-devel] [virt-tools-list] [PATCH] qemu:cpuid: speedup test by 3x times if grub2 is available, Richard W.M. Jones, 2013/02/14
- Re: [Qemu-devel] [virt-tools-list] [PATCH] qemu:cpuid: speedup test by 3x times if grub2 is available, Eduardo Habkost, 2013/02/14
- Re: [Qemu-devel] [virt-tools-list] [PATCH] qemu:cpuid: speedup test by 3x times if grub2 is available, Richard W.M. Jones, 2013/02/14