Re: Tips on tracing bwmon?

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

* Konrad Dybcio (konrad.dybcio@oss.qualcomm.com) wrote:
> On 10/22/26 1:44 PM, Dr. David Alan Gilbert wrote:
> > * 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?
> 
> Unfortunately there aren't.

Bah oh well; thanks for your answers.

Dave

> Konrad
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