Re: Tips on tracing bwmon?

["Dr. David Alan Gilbert" <dave@treblig.org>]

* Konrad Dybcio (konrad.dybcio@oss.qualcomm.com) wrote:
> On 10/20/26 4:27 PM, Dr. David Alan Gilbert wrote:
> > Hi all,
> >   I was looking for some tips on if I can use bwmon to see what interconnect
> > bandwidth is going through the dwc3 usb controllers on my x1 based Asus Zenbook A14.
> > 
> >   I've got usb-ncm gadget wired between a pair of them and I'd
> > like to see what stats are available;
> > (See details of my gadget stuff setup in
> >  https://lore.kernel.org/linux-arm-msm/atJn2jfI_cZy3UMo@gallifrey/T/#u )
> > And that's struggling to get much over 4Gbit/s over the network interface.
> > 
> > One reason I'm curious is because the dwc3-qcom glue sets an average
> > and a peak icc limit, and I wanted to know what the difference was and
> > what the type of timescales were for how long it allowed a peak.
> > 
> > Are there any docs I should look at?
> > 
> > I did:
> >    trace-cmd stream -e icc_bwmon:qcom_bwmon_update > log
> > on both machines and during the run I'm seeing events on exactly 3 of the
> > monitors;
> > 24091000.pmu, 240b5400.pmu, 240b6400.pmu
> > 
> > (In the numbers below I've grepped for that monitor and sed'ed out
> > upto the 'measu_kbps=' part so I can then sort on the meas_kbps)
> > 
> > My reading of the interconnects_summary is these PMUs are
> > somewhere under the llcc_mc@interconnect-1, and in some
> > cases under both chm_apps@  and qns_llcc
> 
> These BWMONs only monitor the CPU-DRAM paths

Thanks for the reply and explanation.

Are there other BWMONs that should show the USB path bandwidth,
and if so how would I watch them?

Thanks again,

> Konrad

Dave
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