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Description of problem: when i boot a winxp guest in amd host will very slow,and the host will call trace. Version-Release number of selected component (if applicable): How reproducible: 100% Steps to Reproduce: 1.copy winXP-32-virtio.qcow2 image from nfs server 10.66.90.128:/vol/S2/kvmauto/windows_img/ to root. 2. boot the guestboot a winxp guest Actual results: boot very slow, more then 20 min,and host call trace. Expected results: boot normally. Additional info: call trace: ------------[ cut here ]------------ WARNING: at arch/x86/kvm/svm.c:729 svm_adjust_tsc_offset+0xac/0xc0 [kvm_amd]() (Tainted: G W --------------- ) Hardware name: OptiPlex 740 Enhanced Modules linked in: vfat fat nfs lockd fscache nfs_acl auth_rpcgss vhost_net macvtap macvlan tun kvm_amd kvm sunrpc cpufreq_ondemand powernow_k8 freq_table mperf bridge stp llc ipv6 ppdev parport_pc parport microcode dcdbas serio_raw k8temp edac_core edac_mce_amd snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore snd_page_alloc sg i2c_nforce2 tg3 ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom pata_acpi ata_generic sata_nv nouveau ttm drm_kms_helper drm i2c_core mxm_wmi video output wmi dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan] Pid: 382, comm: qemu-kvm Tainted: G W --------------- 2.6.32-268.el6.x86_64 #1 Call Trace: [<ffffffff8106b6b7>] ? warn_slowpath_common+0x87/0xc0 [<ffffffff8106b70a>] ? warn_slowpath_null+0x1a/0x20 [<ffffffffa04e921c>] ? svm_adjust_tsc_offset+0xac/0xc0 [kvm_amd] [<ffffffffa049182b>] ? kvm_arch_vcpu_load+0xdb/0x140 [kvm] [<ffffffffa0487e35>] ? vcpu_load+0x55/0x80 [kvm] [<ffffffffa049adf4>] ? kvm_arch_vcpu_ioctl_run+0x24/0x1000 [kvm] [<ffffffff8121a3c1>] ? avc_has_perm+0x71/0x90 [<ffffffffa0484322>] ? kvm_vcpu_ioctl+0x522/0x670 [kvm] [<ffffffff8105b3f3>] ? perf_event_task_sched_out+0x33/0x80 [<ffffffff812784fc>] ? rb_erase+0x1bc/0x310 [<ffffffff81054ba0>] ? __dequeue_entity+0x30/0x50 [<ffffffff8118e5a2>] ? vfs_ioctl+0x22/0xa0 [<ffffffff8118ea6a>] ? do_vfs_ioctl+0x3aa/0x580 [<ffffffff8118ecc1>] ? sys_ioctl+0x81/0xa0 [<ffffffff8100b0f2>] ? system_call_fastpath+0x16/0x1b ---[ end trace 41979d2a53ce41eb ]--- host: kernel: kernel-2.6.32-268.el6.x86_64 qemu-kvm qemu-kvm-0.12.1.2-2.290.el6.x86_64 cpu info processor : 1 vendor_id : AuthenticAMD cpu family : 15 model : 107 model name : AMD Athlon(tm) Dual Core Processor 5400B stepping : 2 cpu MHz : 2800.000 cache size : 512 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch lbrv bogomips : 5611.39 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp tm stc 100mhzsteps mem info [root@amd-5400b-4-4 ~]# free -m total used free shared buffers cached Mem: 3766 3617 148 0 16 1097 -/+ buffers/cache: 2504 1261 Swap: 32767 38 32729 guest info: winxp boot comand: /usr/libexec/qemu-kvm \ -name 'vm1' \ -chardev socket,id=qmp_monitor1,path=/tmp/monitor-qmpmonitor1,server,nowait \ -mon chardev=qmp_monitor1,mode=control \ -chardev socket,id=serial_1,path=/tmp/serial-1,server,nowait \ -device isa-serial,chardev=serial_1 \ -device ich9-usb-uhci1,id=usb1,multifunction=off,bus=pci.0,addr=0x4 \ -drive file='/root/winXP-32-virtio.qcow2',index=0,if=none,id=drive1,media=disk,cache=none,format=qcow2,aio=threads \ -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive1,id=virtio-disk1 \ -device virtio-net-pci,netdev=iddERa13,mac=9a:ac:e9:f0:d7:f3,id=ndev00iddERa13,bus=pci.0,addr=0x3 \ -netdev tap,id=iddERa13,vhost=on,fd=21 \ -m 2048 \ -smp 2,cores=1,threads=1,sockets=2 \ -cpu 'Opteron_G2' \ -device usb-tablet,id=usb-tablet1,bus=usb1.0 \ -vnc :0 \ -rtc base=localtime,clock=host,driftfix=slew \ -M rhel6.3.0 \ -boot order=cdn,once=c,menu=off \ -enable-kvm