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From: | Michael R. Hines |
Subject: | Re: [Qemu-devel] latest master: major slowdown (something spinning?) |
Date: | Wed, 10 Apr 2013 08:43:41 -0400 |
User-agent: | Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 |
Yes, it still happens at that commit string. Is there a specific test or trace I can provide to help track it down? - Michael On 04/10/2013 03:43 AM, Paolo Bonzini wrote:
Il 09/04/2013 19:43, Michael R. Hines ha scritto:*Here's the commit that causes the problem:* $ git checkout d185c094b404b4ff392b77d1244c0233da7d53bd qemu-char: eliminate busy waiting on can_read returning zeroCan you stil reproduce it after commit 1e885b25275fb6763eb947b1e53b2d6911b967a8 Author: Paolo Bonzini <address@hidden> Date: Mon Apr 8 15:03:15 2013 +0200 qemu-char: really fix behavior on can_read = 0 ? Paolo*Symptoms:* When the VM boots everything crawls and the host CPU is at 100%, messages are printing extremely slowly on the VM console and the VM is not making any boot progress......... printing kernel messages once a second or so....... Something in QEMU appears to be spinning. Here's my command line: qemu-system-x86_64 -enable-kvm -m 2048 -smp 2,sockets=1,cores=1,threads=1 -nodefconfig -rtc base=utc -no-shutdown disk.img -serial pty -monitor unix:/tmp/devguest,server,nowait -netdev type=tap,vhost=on,id=hostnet0,script=kvmifup.sh,downscript=kvmifdown.sh -device virtio-net-pci,netdev=hostnet0,mac=12:34:36:00:00:02 -usb -device usb-tablet,id=input0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 - Michael Hines
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