On Sat, Apr 19, 2008 at 12:29 PM, Marcelo Tosatti <[EMAIL PROTECTED]> wrote: > On Mon, Apr 07, 2008 at 06:34:57PM -0300, Marcelo Tosatti wrote: > > > > On Mon, Apr 07, 2008 at 01:53:36PM +0200, Nikola Ciprich wrote: > > > Hi, > > > > > > I also tried paravirt clock again in latest git with kvm-65 patch > > > applied, and problem with cpu-lockups persists: > > > > > > [10813.654806] BUG: soft lockup - CPU#0 stuck for 61s! [swapper:0] > > > [10813.655789] CPU 0: > > > [10813.656624] Modules linked in: virtio_pci virtio_ring virtio_blk > virtio > > > piix dm_snapshot dm_zero dm_mirror dm_mod ide_disk > > > ide_core sd_mod scsi_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd > > > [10813.658805] Pid: 0, comm: swapper Not tainted 2.6.25-rc7 #5 > > > [10813.658805] RIP: 0010:[<ffffffff80222ab2>] [<ffffffff80222ab2>] > > > native_safe_halt+0x2/0x10 > > > [10813.658805] RSP: 0018:ffffffff805adf50 EFLAGS: 00000296 > > > [10813.658805] RAX: 000000019b08eeb0 RBX: ffffffff805f5000 RCX: > > > 000000019b08eeb0 > > > [10813.658805] RDX: 0000000000000006 RSI: 00000000356832b0 RDI: > > > ffffffff805adf38 > > > [10813.658805] RBP: 0000000000000da8 R08: 0000000000000000 R09: > > > 0000000000000000 > > > [10813.658805] R10: 0000000000000001 R11: 0000000000000002 R12: > > > ffffffff802228ed > > > [10813.658805] R13: 00000000000132a0 R14: ffffffff80200bba R15: > > > ffff81000100a280 > > > [10813.658805] FS: 0000000000000000(0000) GS:ffffffff80576000(0000) > > > knlGS:0000000000000000 > > > [10813.658805] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b > > > [10813.658805] CR2: 00007fac0f852000 CR3: 0000000000201000 CR4: > > > 00000000000006e0 > > > [10813.658805] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > > > 0000000000000000 > > > [10813.658805] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: > > > 0000000000000400 > > > [10813.658805] > > > [10813.658805] Call Trace: > > > [10813.658805] [<ffffffff8020a55b>] ? default_idle+0x3b/0x70 > > > [10813.658805] [<ffffffff8020a520>] ? default_idle+0x0/0x70 > > > [10813.658805] [<ffffffff8020a60e>] ? cpu_idle+0x7e/0xe0 > > > [10813.658805] [<ffffffff80211630>] ? pda_init+0x30/0xb0 > > > > > > Can I somehow help to track this one down?? > > > > Hi Nikola, > > > > I just reproduced this on a UP guest. Were you seeing the exact same > > stack trace in the guest with kvm-64 ? > > I've been able to reproduce the problem. Symptoms are that when using > NOHZ vcpu0 LAPIC timer is ticking far less than the others (apparently vcpu0 > is the only one ticking "correctly"): > > > nohz=on with kvmclock > [EMAIL PROTECTED] ~]# cat /proc/timer_stats | grep apic > 13214, 8590 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 13214, 8589 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 13211, 8588 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 389, 8587 qemu-system-x86 apic_mmio_write (apic_timer_fn) > > nohz=off > 3253, 8672 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 2876, 8673 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 2543, 8674 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 2179, 8675 qemu-system-x86 apic_mmio_write (apic_timer_fn) > > no-kvmclock > 1017, 8808 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 1577, 8809 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 1708, 8807 qemu-system-x86 apic_mmio_write (apic_timer_fn) > 1812, 8806 qemu-system-x86 apic_mmio_write (apic_timer_fn) > > > Glauber will start looking at this next week. > > >
>From what me and marcelo discussed, I think there's a possibility that it has marginally something to do with precision of clock calculation. Gerd's patches address that issues. Can somebody test this with those patches (both guest and host), while I'm off ? -- Glauber Costa. "Free as in Freedom" http://glommer.net "The less confident you are, the more serious you have to act." ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
