Hello, On 3/15/21 7:18 AM, Tzvetomir Stoyanov (VMware) wrote: > Basic infrastructure for host - guest timestamp synchronization and a > PoC implementation of PTP-like and KVM algorithms. I'm trying to make some analysis on traces generated by host and guest, so I applied this series and the related dependencies. However, when the KVM algorithm is used, the merging process of the two traces doesn't seem to happen properly. The output of `trace-cmd report -i trace.dat -i trace-tumbleweed.dat` is: trace.dat: cpus=4 trace-tumbleweed.dat: cpus=1 trace.dat: sleep-23948 [002]61124758463654: write_msr: c0000100, value 7f35092875c0 trace.dat: <idle>-0 [000]61124760841508: write_msr: c0000100, value 7f6136b75640 trace.dat: CPU 0/KVM-1640 [000]61124760851620: write_msr: c0011020, value 40000000000000 trace.dat: CPU 0/KVM-1640 [000]61124760861778: read_msr: c0000101, value ffff9b1b76c00000 trace.dat: CPU 0/KVM-1640 [000]61124760862832: read_msr: c0000081, value 23001000000000 trace.dat: CPU 0/KVM-1640 [000]61124760864347: read_msr: c0000082, value ffffffffb5400010 trace.dat: CPU 0/KVM-1640 [000]61124760865225: read_msr: c0000083, value ffffffffb5401670 . . . trace-tumbleweed.dat: IPC I/O Parent-4313 [000]8446232460209009653: write_msr: c0000100, value 7f94535c7640 trace-tumbleweed.dat: IPC I/O Child-4503 [000]8446348845232796661: write_msr: c001011f, value 4 trace-tumbleweed.dat: IPC I/O Child-4503 [000]8447532508154803189: write_msr: c0000100, value 7f945e8d5780 trace-tumbleweed.dat: <idle>-0 [000]8452336523564659701: write_msr: c001011f, value 0 trace-tumbleweed.dat: <idle>-0 [000]8452515224268944373: write_msr: 6e0, value 731478a3bf62 trace-tumbleweed.dat: <idle>-0 [000]8452610851715789813: write_msr: 6e0, value 731478968f37 trace-tumbleweed.dat: <idle>-0 [000]8555757214338495477: write_msr: 6e0, value 731478853ec1 trace-tumbleweed.dat: <idle>-0 [000]8555904475882173429: write_msr: 6e0, value 7314778a60e8 trace-tumbleweed.dat: kworker/0:1-7351 [000]8556355589182174197: write_msr: c0000100, value 7f8373573740 The TimeShift information is inside the guest trace file, so I think this is not a transfer problem. I also tried to remove the last patch, the one related to the KVM clock, in order to use PTP and the two traces are merged correctly. The commands used to record are: Host: # trace-cmd record -C x86-tsc -e kvm:* -e msr:* -A tumbleweed:823 -e msr:* -C x86-tsc sleep 1 Guest: # echo x86-tsc > /sys/kernel/tracing/trace_clock # trace-cmd agent Am I doing something wrong? If necessary, I can provide more info about my setup, or do more tests. Thanks and Regards, Stefano
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