Very high cpu usage on one core about libreqos

[thebracket]

It sounds like your network.json is concentrating the majority of your traffic on one CPU. Maybe try a "flat" topology? That should divide the load equally. (The worst case is if you have a top level node, a node beneath it and everything under that - that will cram everything onto one CPU). What CPU are you using? I'm surprised you aren't getting a bit more on a single core. (Unless hyper threading is enabled and it unluckily picked an HT virtual core, or you are in a VM - both of those hit performance terribly)

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On Thu, Dec 28, 2023, 3:08 AM arm946ejs ***@***.***> wrote: Runing libreqos 1.4 on ubuntu 22.04.3 with XDP bridge. I got very high cpu usage on one core. Nearly 100% @ 800Mbps downloading. Load balance not working at all. System build up with J4125 and Mellanox cx4 lx. I can see XPD ids from "ip a" shell command. I don't know what is going on. I build another system with different NIC which is intel x520 and they all have the same problem. Here is the log and test result. Snipaste_2023-12-28_15-59-40.jpg (view on web) <https://github.com/LibreQoE/LibreQoS/assets/21214321/72c1f59a-1dc8-42b8-96ed-17a7b684b441> Snipaste_2023-12-28_15-45-51.jpg (view on web) <https://github.com/LibreQoE/LibreQoS/assets/21214321/a54292d1-6a32-4778-a0e6-5fff5b7044bb> log.txt <https://github.com/LibreQoE/LibreQoS/files/13784388/log.txt> — Reply to this email directly, view it on GitHub <#447>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADRU434TMFGXQGPPSL2WDVDYLUSGHAVCNFSM6AAAAABBFGZ2LCVHI2DSMVQWIX3LMV43ASLTON2WKOZSGA2TQMJSG4ZDKNA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[arm946ejs]

Dear thebracket: Thank you for your reply. I did a new test using the following configuration file. By using a flat topology. There is still a single core full loading situation and this time the load goes form core 0 to core 1. I tried to install the Mellanox official network card driver but there is no difference. I recknized that the count of system local interrupt is very high on core 0. cpumap thread take a lot of resource. Maybe this is the proble. My system uses intel J4125 4 cores low-power CPU without hyper threading. Bare-metal runing Ubuntu system. All pcie lans comes from PCH. thanks! ***@***.*** From: thebracket Date: 2023-12-29 10:28 To: LibreQoE/LibreQoS CC: arm946ejs; Author Subject: Re: [LibreQoE/LibreQoS] Very high cpu usage on one core (Issue #447) It sounds like your network.json is concentrating the majority of your traffic on one CPU. Maybe try a "flat" topology? That should divide the load equally. (The worst case is if you have a top level node, a node beneath it and everything under that - that will cram everything onto one CPU). What CPU are you using? I'm surprised you aren't getting a bit more on a single core. (Unless hyper threading is enabled and it unluckily picked an HT virtual core, or you are in a VM - both of those hit performance terribly)

On Thu, Dec 28, 2023, 3:08 AM arm946ejs ***@***.***> wrote: Runing libreqos 1.4 on ubuntu 22.04.3 with XDP bridge. I got very high cpu usage on one core. Nearly 100% @ 800Mbps downloading. Load balance not working at all. System build up with J4125 and Mellanox cx4 lx. I can see XPD ids from "ip a" shell command. I don't know what is going on. I build another system with different NIC which is intel x520 and they all have the same problem. Here is the log and test result. Snipaste_2023-12-28_15-59-40.jpg (view on web) <https://github.com/LibreQoE/LibreQoS/assets/21214321/72c1f59a-1dc8-42b8-96ed-17a7b684b441> Snipaste_2023-12-28_15-45-51.jpg (view on web) <https://github.com/LibreQoE/LibreQoS/assets/21214321/a54292d1-6a32-4778-a0e6-5fff5b7044bb> log.txt <https://github.com/LibreQoE/LibreQoS/files/13784388/log.txt> — Reply to this email directly, view it on GitHub <#447>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADRU434TMFGXQGPPSL2WDVDYLUSGHAVCNFSM6AAAAABBFGZ2LCVHI2DSMVQWIX3LMV43ASLTON2WKOZSGA2TQMJSG4ZDKNA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

— Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***>

[rchac]

@arm946ejs your Intel J4125 has a very low passmark single-thread score (1166), and is not a good choice for delivering plans above 100 Mbps. You need a system with a CPU that has a higher single-thread passmark score. https://libreqos.readthedocs.io/en/latest/docs/SystemRequirements/Compute.html

Our estimates were that a CPU like the Intel J4125 would only be capable of queuing 100 Mbps plans, so it is actually quite surprising to see one passing 800 Mbps on a single CPU.

You'll want to consider a more powerful system such as the ones listed here https://libreqos.readthedocs.io/en/latest/docs/SystemRequirements/Compute.html#server-recommendations