On Mon, Oct 5, 2020 at = 1:57 PM Pasha Ghabussi <pashag@goog= le.com> wrote:

Hello all,
We would really appreciate it = if you can take a few minutes to read the following proposal and let us kno= w your thoughts and suggestions.
We are developing a tool to investigate perfo= rmance problems by looking at DBus traffic dumps. Current DBus inspection a= nd visualization tools do not represent the DBus events similar to a typica= l performance profiler. Additionally, these tools do not address typical BM= C workloads such as IPMI and ASIO. Hence, identifying potential performance= problems requires inspecting the raw BMC DBus traffic, which can become a = long and complex process. We want to add a graphical interface to webui-vue= to visualize the DBus traffic to address the abovementioned problem.

There= have been DBus and IPMI performance-related discussions in the OpenBMC com= munity, both of which can be helped by this work: IPMI-related issues start= ed to appear as early as in 2017. One issue (#2630) describes a problem related to large numbers of sensors.= Its follow-up (#3098)<= /a> mentions = =E2=80=9Chostboot crashes due to poor IPMI performance=E2=80=9D. Another issue (#2519) describes a commonly-= seen problem of IPMI taking very long to respond (> 5s).
There are also discussion= s on Red= Fish performance on the mailing list; A patch optimized DBus performance by introducing a cac= he for name translation.
All the performance investigations listed above involv= e DBus and may be helped by this work.

We are planning to use the BMCweb = file hosting functionality to access the DBus event dumps and visualize the= events in the web UI. The available profiling tools such as db= us-pcap, Wireshark, Bustl= e, = Snyh, or DFeet do not provide the exact= functionality we are looking for. Our goal is to develop functionalities s= imilar to other widely used profilers such as GPUView or VTune Profiler.

One alternative solution conside= red was to stream DBus requests over websocket, but the existing websocket = endpoints available on BMC webserver do not provide the exact information w= e need.

Requirements and Scalability:
Should provide the adequ= ate functionalities to filter, visualize the events timeline, and group the= DBus traffic based on multiple criteria such as type, source, destination,= path, interface, demon signatures, and more.
Should support capture of DBus messages using as little re= sources as possible.
Should= be able to show many (~thousands of) entries on screen simultaneously
Integration with webui-vue=

Thank you