On Wed, Oct 05, 2011 at 11:36:53AM -0700, Robin Lee Powell wrote: > On Wed, Oct 05, 2011 at 08:21:53PM +0200, Avi Kivity wrote: > > On 10/04/2011 09:40 PM, Robin Lee Powell wrote: > > >> >When I run tcpdump on a *guest*, the entire guest completely > > >> >freezes up; no response even to hitting enter on the console. > > >> >"virsh list" also locks up whenever it tries to print state > > >> >about that VM (but the others work fine), as does any other > > >> >operation that touches the state of that VM. The VM takes up > > >> >100% of CPU on one core while this is happening. Eventually > > >> >it gets better. > > >> > > >> You can use 'perf kvm' to figure out where the guest is > > >> spinning. > > > > > >OK, gathered with: > > > > > >sudo perf kvm --guest --host record -o /tmp/kvm_perf -a > > > > > >I don't know how to read it at all, so it's at > > >http://users.digitalkingdom.org/~rlpowell/media/public/kvm_perf > > > > > > > Not accessible. > > -_- Fixed. > > > Please post the output of 'perf kvm report > log'. > > # Events: 42K > # > # Overhead Command Shared Object Symbol > # ........ ........ ................ ...... > # > 100.00% qemu-kvm [unknown] [g] 0xffffffff8111c7a5 > > > # > # (For a higher level overview, try: perf report --sort comm,dso) > # > > How helpful is that? -_- > > I'm guessing I need --guestkallsyms= ; since they're all the same > kernel I thought it'd figure it out. I'll redo. OK, here's a "better" version. # Events: 46K cycles # # Overhead Command Shared Object Symbol # ........ ........ ....................... ....................... # 74.81% qemu-kvm [unknown] [u] 0x7fbdffd4c18a 25.14% qemu-kvm [guest.kernel.kallsyms] [g] 0xffffffff811112f0 0.03% qemu-kvm [virtio_net] [g] 0x83e8 0.01% qemu-kvm [virtio_balloon] [g] 0x103b 0.00% qemu-kvm [ip6_tables] [g] compat_standard_to_user 0.00% qemu-kvm [ipv6] [g] icmpv6_send 0.00% qemu-kvm [virtio_blk] [g] 0x7783 0.00% qemu-kvm [ipv6] [g] raw6_seq_show 0.00% qemu-kvm [ipv6] [g] icmpv6_rcv 0.00% qemu-kvm [virtio_net] [g] fini 0.00% qemu-kvm [ip6table_filter] [g] 0x9b5 # # (For a higher level overview, try: perf report --sort comm,dso) # The file is also updated. -Robin -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
