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, 6 Feb 2024 13:26:24 +0200
From: Mathias Nyman <mathias.nyman@...ux.intel.com>
To: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>,
 "Christian A. Ehrhardt" <lk@...e.de>, niklas.neronin@...ux.intel.com
Cc: Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
 linux-netdev@...r.kernel.org, Greg KH <gregkh@...uxfoundation.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 5.2.2024 23.08, Mikhail Gavrilov wrote:
> On Mon, Feb 5, 2024 at 1:47 AM Christian A. Ehrhardt <lk@...e.de> wrote:
> 
> Thanks for real help.
> Now I spotted a really bad commit.
> 
> 57e153dfd0e7a080373fe5853c5609443d97fa5a is the first bad commit
> commit 57e153dfd0e7a080373fe5853c5609443d97fa5a
> 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
> 
>      Current xHCI driver only supports one "interrupter", meaning we will
>      only use one MSI/MSI-X interrupt line. Thus, add handler only to the
>      first interrupt line.
> 
>      Signed-off-by: Niklas Neronin <niklas.neronin@...ux.intel.com>
>      Co-developed-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
>      Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
>      Link: https://lore.kernel.org/r/20231201150647.1307406-13-mathias.nyman@linux.intel.com
>      Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
>   drivers/usb/host/xhci-pci.c | 35 ++++++++++-------------------------
>   1 file changed, 10 insertions(+), 25 deletions(-)
> 
> Niklas, Mathias I spotted decreased network speed on sending when
> transferring files via sftp between my workstations in the local
> network.
> And bisection of issue leads me to this commit.
> 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
> 

This seems odd, not sure how this usb host change would impact your network speed.

Could you try reverting that patch from 6.8-rc1 and see if it helps?

There are some other patches on top of it that needs to be reverted first.
These should be enough:

36b24ebf9a04 xhci: minor coding style cleanup in 'xhci_try_enable_msi()
9831960df237 xhci: rework 'xhci_try_enable_msi()' MSI and MSI-X setup code
dfbf4441f2d3 xhci: change 'msix_count' to encompass MSI or MSI-X vectors
a795f708b284 xhci: refactor static MSI function
74554e9c2276 xhci: refactor static MSI-X function
f977f4c9301c xhci: add handler for only one interrupt line

That patch changes how we request MSI/MSI-X interrupt(s) for xhci.

Is there any change is /proc/interrupts between a good and bad case?
Such as xhci_hcd using MSI-X instead of MSI, or eth0 and xhci_hcd
interrupting on the same CPU?

Thanks
Mathias