linux-kernel - Re: This is the fourth time I’ve tried to find what led to the regression of outgoing network speed and each time I find the merge commit 8c94ccc7cd691472461448f98e2372c75849406c

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Date: Tue, 20 Feb 2024 15:43:41 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>,
 Mathias Nyman <mathias.nyman@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>
Cc: "Christian A. Ehrhardt" <lk@...e.de>, niklas.neronin@...ux.intel.com,
 Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
 Greg KH <gregkh@...uxfoundation.org>, linux-usb@...r.kernel.org,
 linux-x86_64@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: This is the fourth time I’ve tried to find what led to the regression of outgoing network speed and each time I find the merge commit 8c94ccc7cd691472461448f98e2372c75849406c



On 2/20/24 15:41, Randy Dunlap wrote:
> {+ tglx]

(this time for real)

> 
> On 2/20/24 15:19, Mikhail Gavrilov wrote:
>> On Mon, Feb 19, 2024 at 2:41 PM Mikhail Gavrilov
>> <mikhail.v.gavrilov@...il.com> wrote:
>>>
>>> I installed irqbalance daemon and nothing changed.
>>> So who is responsible for irq balancing?
>>
>> Sorry for the noise. Can anyone give me an answer?
>> Who is responsible for distributing interrupts in Linux?
>> I spotted network performance regression and it turned out, this was
>> due to the network card getting other interrupt. It is a side effect
>> of commit 57e153dfd0e7a080373fe5853c5609443d97fa5a.
> 
> That's a merge commit (AFAIK, maybe not so much). The commit in mainline is:
> 
> commit f977f4c9301c
> Author: Niklas Neronin <niklas.neronin@...ux.intel.com>
> Date:   Fri Dec 1 17:06:40 2023 +0200
> 
>     xhci: add handler for only one interrupt line
> 
>> Installing irqbalance daemon did not help. Maybe someone experienced
>> such a problem?
>>
> 
> Thomas, would you look at this, please?
> 
> A network device and xhci (USB) driver are now sharing interrupts.
> This causes a large performance decrease for the networking device.
> 
> The thread begins here:
> https://lore.kernel.org/lkml/CABXGCsNnUfCCYVSb_-j-a-cAdONu1r6Fe8p2OtQ5op_wskOfpw@mail.gmail.com/
> 
> 
> motherboard:
> "My motherboard is MPG-B650I-EDGE-WIFI looks like it is related to the
> mentioned commit.
> https://www.msi.com/Motherboard/MPG-B650I-EDGE-WIFI"
> 
> network device:
> Network: RTL8125 2.5GbE Controller (rev 05)
> 
> 
> thanks.

-- 
#Randy