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Re: [Qemu-devel] Performance regression "ioport: Switch dispatching to m
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From: |
Jan Kiszka |
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Subject: |
Re: [Qemu-devel] Performance regression "ioport: Switch dispatching to memory core layer" |
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Date: |
Mon, 15 Jul 2013 13:01:36 +0200 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2013-07-15 12:52, Stefan Hajnoczi wrote:
> The following qemu.git commit adds a ~2 minute regression in boot time
> to a x86_64 live CD:
>
> commit b40acf99bef69fa8ab0f9092ff162fde945eec12
> Author: Jan Kiszka <address@hidden>
> Date: Mon Jun 24 10:45:09 2013 +0200
>
> ioport: Switch dispatching to memory core layer
>
> After the ISOLINUX menu, the display goes white and sits there for about
> 2 minutes on my laptop before the usual Linux boot screen appears.
>
> $ qemu-system-x86_64 -enable-kvm -cpu host -m 1024 -cdrom ~/iso/livecd.iso
>
> The parent commit immediately goes to the usual boot screen after
> ISOLINUX. Unfortunately I don't have a ISO download link for the live
> CD.
Can you share it otherwise (before I spend time on recreating something
that does not trigger it)?
>
> Any ideas?
What does perf say during that time? What ftrace regarding the port
numbers and access types?
Jan
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