Thanks for your reply :-) The QEMU version is 1.5.1,and the KVM version is 3.6 QEMU command: /usr/bin/qemu-kvm -name win2008_dc_5 -S -machine pc-i440fx-1.5,accel=kvm,usb=off -m 2048 -realtime mlock=off -smp 4,maxcpus=64,sockets=16,cores=4,threads=1 -uuid 13e08e3e-cd23-4450-8bd3-60e7c220316d -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/win2008_dc_5.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,clock=vm,driftfix=slew -no-hpet -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x4 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive file=/dev/vmdisk/win2008_dc_5,if=none,id=drive-scsi0-0-0-0,format=qcow2,cache=none,aio=native -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=1 -netdev tap,fd=28,id=hostnet0,vhost=on,vhostfd=29 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:16:49:23,bus=pci.0,addr=0x3 -chardev socket,id=charchannel0,path=/var/run/libvirt/qemu/win2008_dc_5.extend,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.1 -chardev socket,id=charchannel1,path=/var/run/libvirt/qemu/win2008_dc_5.agent,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=org.qemu.guest_agent.0 -device usb-tablet,id=input0 -vnc 0.0.0.0:4 -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 (gdb) bt #0 0x00007f9ba661a423 in poll () from /lib64/libc.so.6 #1 0x000000000059460f in os_host_main_loop_wait (timeout=4294967295) at main-loop.c:226 #2 0x00000000005946a4 in main_loop_wait (nonblocking=0) at main-loop.c:464 #3 0x0000000000619309 in main_loop () at vl.c:2182 #4 0x000000000061fb5e in main (argc=54, argv=0x7fff879830c8, envp=0x7fff87983280) at vl.c:4611 Main thread's strace message: # strace -p 6386 Process 6386 attached - interrupt to quit restart_syscall(<... resuming interrupted call ...> cpu thread's strace message: # strace -p 6389 Process 6389 attached - interrupt to quit rt_sigtimedwait([BUS USR1], 0x7f9ba36fbc00) = -1 EAGAIN (Resource temporarily unavailable) rt_sigpending([]) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ioctl(17, 0xae80, 0) = 0 ... Thanks! --xie -----Original Message----- From: Paolo Bonzini [mailto:paolo.bonzini@xxxxxxxxx] On Behalf Of Paolo Bonzini Sent: Tuesday, October 15, 2013 7:52 PM To: Xiexiangyou Cc: qemu-devel@xxxxxxxxxx; qemu-devel-request@xxxxxxxxxx; kvm@xxxxxxxxxxxxxxx; Huangpeng (Peter); Luonengjun Subject: Re: [RFH] Qemu main thread is blocked in g_poll in windows guest Il 15/10/2013 12:21, Xiexiangyou ha scritto: > Hi all: > > Windows2008 Guest run without pressure for long time. Sometimes, it > stop and looks like hanging. But when I connect to it with VNC, It > resume to run, but VM's time is delayed . When the vm is hanging, I > check the main thread of QEMU. I find that the thread is blocked in > g_poll function. it is waiting for a SIG, However, there is no SIG . > > I tried the clock with "hpet" and "no hpet", but came out the same > problem. Then I upgrade the glibc to newer, it didn't work too. I'm > confused. Is the reason that VM in sleep state and doesn't emit the > signal. I set the windows 's "power option", enable/disable the > "allow the wake timers", I didn't work. > > Is anybody have met the same problem before, or know the reason. Your > reply will be very helpful. This post is missing a few pieces of information: * What version of QEMU is this? * What is the command line? * How do you know g_poll is waiting for a signal and not for a file descriptor? * What is the backtrace of the main thread? What is the backtrace of the VCPU thread? etc. Paolo -- 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
