Re: [PATCH] trace-cmd: Do not use instance from trace context

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Hi,

On Fri, Jul 29, 2022 at 8:55 PM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
>
> On Fri, 29 Jul 2022 17:48:08 -0400
> Alexander Aring <aahringo@xxxxxxxxxx> wrote:
>
> > >
> > > Bah, I kept getting confused by when to use instance vs ctx->instance,
> > > and I guess I messed this one up.
> >
> > I tested it and it seems to fix the problem..., so if it's not to late:
> >
> > Tested-by: Alexander Aring <aahringo@xxxxxxxxxx>
>
> Not too late. I haven't downloaded the patch from patchwork yet (nor my
> other patches).
>
> >
> > I am not sure what I should expect from the PTP time synchronization
> > over IP capable interfaces (it never worked for me) but I need to say
> > it is significantly slower than kvm time synchronization with vsock
> > and I am using only virtual interfaces. On the agents I get a couple
> > of:
>
> Well, kvm time synchronization doesn't do much between the host and
> guest. And I'm looking at making it do even less. That's because the
> kvm synchronization is just "read the offset and shift of the guest
> from the host and do the calculations via the reader (trace-cmd
> report or kernelshark)". But the P2P is sending packets back and forth
> between the host and guest and trying to figure out the round trip
> latency.
>

okay. To be more specific it took about ~20 minutes until I saw the
"Press Ctrl-C to stop recording..." message for 3 agents. Is that
normal?

- Alex




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