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<p class="MsoNormal">Hi ALL,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> I am running the RHEL 7.1 in both host and guest for a low latency network performance test.<o:p></o:p></p>
<p class="MsoNormal"> I use the realtime-virtual-host for the host and realtime-virtual-guest for guest.<o:p></o:p></p>
<p class="MsoNormal"> These optimize really improve my network performance in the RFC 2544 throughput test.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> But I fund there are error in the guest OS, when I enable the nohz_full.<o:p></o:p></p>
<p class="MsoNormal"> Looks like the nohz_full can’t be enable in the guest OS.<o:p></o:p></p>
<p class="MsoNormal"> Do we need remove the nohz_full in the realtime-virtual-guest for guest?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> Here is information from the Guest OS.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">[root@localhost ~]# cat /proc/cmdline<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">BOOT_IMAGE=/vmlinuz-3.10.0-229.el7.x86_64 root=/dev/mapper/centos-root ro rd.lvm.lv=centos/root rd.lvm.lv=centos/swap crashkernel=auto rhgb quiet default_hugepagesz=1G hugepagesz=1G hugepages=2 nmi_watchdog=0 selinux=0
isolcpus=2-3 nohz_full=2-3 intel_pstate=disable nosoftlockup<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ------------[ cut here ]------------<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ------------[ cut here ]------------<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: WARNING: at kernel/time/tick-sched.c:187 can_stop_full_tick+0x119/0x1e0()<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: WARNING: at kernel/time/tick-sched.c:187 can_stop_full_tick+0x119/0x1e0()<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: NO_HZ FULL will not work with unstable sched clock<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: NO_HZ FULL will not work with unstable sched clock<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: Modules linked in:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: Modules linked in:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: CPU: 3 PID: 26 Comm: migration/3 Not tainted 3.10.0-229.el7.x86_64 #1<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: CPU: 2 PID: 22 Comm: migration/2 Not tainted 3.10.0-229.el7.x86_64 #1<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.1-0-g4adadbd-20150316_085822-nilsson.home.kraxel.org 04/01/2014<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.1-0-g4adadbd-20150316_085822-nilsson.home.kraxel.org 04/01/2014<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff88013fd83ee8<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff88013fd03ee8<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: 00000000ed88478b<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: 000000007151008b<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff88013fd83ea0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff88013fd03ea0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffffffff81604b0a<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffffffff81604b0a<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff88013fd83ed8<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff88013fd03ed8<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffffffff8106e34b<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffffffff8106e34b<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff88013fd8da40<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff88013fd0da40<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: 0000000000000003<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: 0000000000000002<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff880036cd7d01<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff880036cd7d01<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: 0000000000000282<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: 0000000000000282<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff880139beffd8<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff880139bdbfd8<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff88013fd83f40<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ffff88013fd03f40<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: Call Trace:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: Call Trace:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: <IRQ><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: <IRQ><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff81604b0a>] dump_stack+0x19/0x1b<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff81604b0a>] dump_stack+0x19/0x1b<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8106e34b>] warn_slowpath_common+0x6b/0xb0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8106e34b>] warn_slowpath_common+0x6b/0xb0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8106e3ec>] warn_slowpath_fmt+0x5c/0x80<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8106e3ec>] warn_slowpath_fmt+0x5c/0x80<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810d0eb9>] can_stop_full_tick+0x119/0x1e0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810d0eb9>] can_stop_full_tick+0x119/0x1e0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810d1200>] tick_nohz_irq_exit+0x80/0xb0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810d1200>] tick_nohz_irq_exit+0x80/0xb0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff81077f0b>] irq_exit+0x8b/0x120<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff81077f0b>] irq_exit+0x8b/0x120<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff81616fd5>] smp_apic_timer_interrupt+0x45/0x60<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff81616fd5>] smp_apic_timer_interrupt+0x45/0x60<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8161569d>] apic_timer_interrupt+0x6d/0x80<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8161569d>] apic_timer_interrupt+0x6d/0x80<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: <EOI><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: <EOI><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810f2952>] ? multi_cpu_stop+0x82/0xf0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810f2952>] ? multi_cpu_stop+0x82/0xf0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810f28d0>] ? cpu_stop_should_run+0x50/0x50<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810f28d0>] ? cpu_stop_should_run+0x50/0x50<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810f2b58>] cpu_stopper_thread+0x88/0x160<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810f2b58>] cpu_stopper_thread+0x88/0x160<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810a478e>] ? finish_task_switch+0xee/0x170<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810a478e>] ? finish_task_switch+0xee/0x170<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff81609925>] ? __schedule+0x2c5/0x7b0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff81609925>] ? __schedule+0x2c5/0x7b0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8109fdaf>] smpboot_thread_fn+0xff/0x1a0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8109fdaf>] smpboot_thread_fn+0xff/0x1a0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8109fcb0>] ? lg_global_unlock+0xc0/0xc0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8109fcb0>] ? lg_global_unlock+0xc0/0xc0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8109739f>] kthread+0xcf/0xe0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8109739f>] kthread+0xcf/0xe0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810972d0>] ? kthread_create_on_node+0x140/0x140<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810972d0>] ? kthread_create_on_node+0x140/0x140<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8161497c>] ret_from_fork+0x7c/0xb0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff8161497c>] ret_from_fork+0x7c/0xb0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810972d0>] ? kthread_create_on_node+0x140/0x140<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: [<ffffffff810972d0>] ? kthread_create_on_node+0x140/0x140<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ---[ end trace 53841d7ee8fd2cd6 ]---<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">Jul 28 09:59:46 localhost kernel: ---[ end trace 53841d7ee8fd2cd7 ]---<o:p></o:p></p>
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