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Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2

From: Avi Kivity
Subject: Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?
Date: Wed, 04 Aug 2010 19:54:29 +0300
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100720 Fedora/3.1.1-1.fc13 Thunderbird/3.1.1

 On 08/04/2010 07:45 PM, Alexander Graf wrote:

I see two alternatives out of this mess:

1) Speed up string PIO so we're actually fast again.

Certainly, the best option given that it needs no new interfaces, and improves the most workloads.

2) Using a different interface (that could also be DMA fw_cfg - remember, we're 
on a private interface anyways)

A guest/host interface is not private.

Admittedly 1 would also help in more cases than just booting with -kernel and 
-initrd, but if that won't get us to acceptable levels (and yes, 8 seconds for 
100MB is unacceptable) I don't see any way around 2.

3) don't use -kernel for 100MB or more.  It's not the right tool.

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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