Hi Dario, On 9.02.21 г. 18:13 ч., Dario Faggioli wrote:
Indeed it does, thanks a lot again. Now, if I try "KVM Combo Plot": - I still see super weird results if I use the KVM clock from last patch in Tzvetomir series (but I guess I'll report it there).
Can you share a screenshot of the one that looks weird. And please do some deeper zooming because it is very hard to judge about the quality of the sync from such a broad time window.
- If I use PTP, that kind of works. If I trace a `sleep 1` on the host, the result is like this: http://xenbits.xen.org/people/dariof/kernelshark-v2-ptp.png
Is this a PTP synchronization?
So, there is ~ 1 sec of data from the guest, coming from trace-cmd agent. The host, however, went on and traced a little bit longer, even after closing the connection. It's not too terrible, I'm just curious whether this is known or it's something weird and it's only me seeing it.
I think this is normal.But anyway Ceco (Tzvetomir) is the right person to answer questions about the timestamp synchronization. Unfortunately he is on vacation till the end of the week.
Thanks a lot! Yordan
Evaluating the correctness and the accuracy of the synchronization is a little bit of a challenge, especially for me that I'm not used to it. And, at least in part, because I still don't have this change in the kernel I'm using right now, so some kvm_entry trace points are not recorded, which means it's tricky pairing VMEntries and VMExits: https://lore.kernel.org/lkml/160873470698.11652.13483635328769030605.stgit@Wayrath/ It should come with 5.11, but I think I'll quickly apply it to the 5.10 that I'm running, to try to understand better hat's going on.
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