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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:1.9.2.7) 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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