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[Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.3
From: |
Richard W.M. Jones |
Subject: |
[Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35? |
Date: |
Tue, 3 Aug 2010 12:13:06 +0100 |
User-agent: |
Mutt/1.5.20 (2009-12-10) |
qemu compiled from today's git. Using the following command line:
$qemudir/x86_64-softmmu/qemu-system-x86_64 -L $qemudir/pc-bios \
-drive file=/dev/null,if=virtio \
-enable-kvm \
-nodefaults \
-nographic \
-serial stdio \
-m 500 \
-no-reboot \
-no-hpet \
-net user,vlan=0,net=169.254.0.0/16 \
-net nic,model=ne2k_pci,vlan=0 \
-kernel /tmp/libguestfsEyAMut/kernel \
-initrd /tmp/libguestfsEyAMut/initrd \
-append 'panic=1 console=ttyS0 udevtimeout=300 noapic acpi=off
printk.time=1 cgroup_disable=memory selinux=0
guestfs_vmchannel=tcp:169.254.2.2:35007 guestfs_verbose=1 TERM=xterm-color '
With kernel 2.6.35 [*], this takes about 1 min 20 s before the guest
starts.
If I revert back to kernel 2.6.34, it's pretty quick as usual.
strace is not very informative. It's in a loop doing select and
reading/writing from some file descriptors, including the signalfd and
two pipe fds.
Anyone seen anything like this?
Rich.
[*] This Fedora kernel:
http://koji.fedoraproject.org/koji/buildinfo?buildID=187085
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
libguestfs lets you edit virtual machines. Supports shell scripting,
bindings from many languages. http://et.redhat.com/~rjones/libguestfs/
See what it can do: http://et.redhat.com/~rjones/libguestfs/recipes.html
- [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?,
Richard W.M. Jones <=
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Gleb Natapov, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Richard W.M. Jones, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Gleb Natapov, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Richard W.M. Jones, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Richard W.M. Jones, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Richard W.M. Jones, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Richard W.M. Jones, 2010/08/03