| kata-irc-bot | <xwlpt> @eric.ernst @chen.bo Thanks for reply. You can run `perf top` inside the VM (Need to install this manually) or `perf top -p <qemu process>` to do the cpu profiling. @eric.ernst What’s LiuBin’s observability PR? Can you share me the link? thanks | 00:10 |
|---|---|---|
| kata-irc-bot | <chen.bo> @xwlpt https://github.com/kata-containers/kata-containers/pull/297 | 00:11 |
| kata-irc-bot | <eric.ernst> shameless plug to overview @xwlpt :) | 00:12 |
| kata-irc-bot | <eric.ernst> https://medium.com/kata-containers/kata-updates-from-the-project-teams-gathering-72cc565e5675 | 00:12 |
| kata-irc-bot | <chen.bo> @xwlpt Also, can you share the general command of qemu where you did the perf? I think the CLI to qemu will also make quite some differences for the profiling result. | 00:13 |
| kata-irc-bot | <xwlpt> perf top -g -p <qemu pid> | 00:13 |
| kata-irc-bot | <xwlpt> Really good feature. Thanks | 00:15 |
| kata-irc-bot | <chen.bo> What about the qemu command? Will that make difference? | 00:16 |
| kata-irc-bot | <chen.bo> I am assuming you are profiling qemu, which I thought how you ran qemu will make a (big) difference on it profiling result. | 00:17 |
| kata-irc-bot | <eric.ernst> I’m assuming he’s getting pid after doing docker run --runtime=kata-qemu ?? | 00:18 |
| kata-irc-bot | <chen.bo> Oh, ok. @xwlpt is profiling the qemu launched by kata-runtime? | 00:18 |
| kata-irc-bot | <xwlpt> Yes. | 00:19 |
| kata-irc-bot | <eric.ernst> I assume so, but let’s see what @xwlpt can clarify | 00:19 |
| kata-irc-bot | <xwlpt> Just the qemu process. | 00:19 |
| kata-irc-bot | <chen.bo> ok. That makes sense. Let me try it. Newbie to perf. I will keep you posted. :slightly_smiling_face: | 00:22 |
| kata-irc-bot | <xwlpt> @eric.ernst Really good informations. Thanks for this. Will follow this and check the update periodically. | 01:33 |
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| kata-irc-bot | <xwlpt> This is due to the guest vm’s cpu idle and then call hlt to make cpu idle. The qemu try to do the halt poll. | 13:54 |
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| kata-irc-bot | <chen.bo> @xwlpt Run latestest kata w/ qemu on a very trivial workload `docker run --runtime=kata-qemu -itd alpine` , from where run perf on qemu launched by kata. So far got this: | 17:29 |
| kata-irc-bot | <chen.bo> ```Samples: 5K of event 'cycles', 4000 Hz, Event count (approx.): 10135068 lost: 0/0 drop: 0/0 Children Self Shared Object Symbol + 73.85% 0.02% [kernel] [k] do_syscall_64 \u2592 + 62.73% 2.41% [unknown] [k] 0000000000000000 \u25c6 40.90% 2.38% [kernel] [k] kvm_arch_vcpu_ioctl_run | 17:29 |
| kata-irc-bot | \u2592 + 21.49% 1.75% [kernel] [k] do_sys_poll \u2592 17.60% 0.01% [kernel] [k] kvm_vcpu_block \u2592 + 16.40% 1.70% [kernel] [k] vcpu_enter_guest \u2592 12.15% 0.01% [kernel] [k] schedule | 17:29 |
| kata-irc-bot | \u2592 11.82% 0.45% [kernel] [k] __schedule \u2592 + 7.54% 0.98% [kernel] [k] eventfd_poll \u2592 7.33% 0.00% [kernel] [k] entry_SYSCALL_64_after_hwframe \u2592 6.82% 0.07% [kernel] [k] vmx_handle_exit | 17:29 |
| kata-irc-bot | \u2592 6.73% 1.32% [kernel] [k] try_to_wake_up \u2592 + 6.56% 2.17% [kernel] [k] __pollwait \u2592 5.96% 0.00% [kernel] [k] kvm_arch_vcpu_runnable \u2592 5.17% 0.00% [unknown] [k] 0x007570632d34365f | 17:29 |
| kata-irc-bot | \u2592 5.17% 0.00% [unknown] [k] 0x0000000000000238 \u2592 5.17% 0.00% qemu-system-x86_64 [.] 0x000000000088fb80 \u2592 5.17% 0.00% qemu-system-x86_64 [.] 0x0000000000968c0b \u2592 5.17% 0.00% [kernel] [k] __x64_sys_ioctl | 17:29 |
| kata-irc-bot | \u2592 5.17% 0.00% [kernel] [k] ksys_ioctl \u2592 5.17% 0.00% [kernel] [k] do_vfs_ioctl \u2592 5.17% 0.00% [kernel] [k] kvm_vcpu_ioctl \u2592 5.03% 0.71% [kernel] [k] vmx_vcpu_run \u2592 | 17:29 |
| kata-irc-bot | + 4.72% 4.71% [kernel] [k] __fget \u2592 4.72% 0.00% [kernel] [k] __fget_light \u2592 4.34% 0.00% [kernel] [k] __wake_up_common \u2592 4.30% 4.30% [kernel] [k] entry_SYSCALL_64 \u2592 | 17:29 |
| kata-irc-bot | 4.22% 0.43% [kernel] [k] kvm_apic_has_interrupt \u2592 3.67% 0.00% [kernel] [k] kvm_sched_in \u2592 3.58% 0.16% [kernel] [k] poll_schedule_timeout.constprop.11 \u2592 3.40% 1.07% [kernel] [k] ____sys_sendmsg \u2592 + 3.39% | 17:29 |
| kata-irc-bot | 1.64% [kernel] [k] vmx_vcpu_run.part.94 \u2592 3.26% 0.30% [kernel] [k] kvm_arch_vcpu_load \u2592 3.09% 0.00% [kernel] [k] handle_ept_misconfig \u2592 3.08% 1.04% [kernel] [k] ioeventfd_write ``` | 17:29 |
| kata-irc-bot | <chen.bo> read_tsc seems to be fine for me. I am running on baremetal with my dev machine, bionic distro, kernel 5.3.0-59-generic. | 17:30 |
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