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From: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Date: Tue, 6 Feb 2024 21:12:24 +0500
Message-ID: <CABXGCsPjW_Gr4fGBzYSkr_4tsn0fvuT72G-YJYXcb1a4kX=CQw@mail.gmail.com>
Subject: =?UTF-8?Q?Re=3A_This_is_the_fourth_time_I=E2=80=99ve_tried_to_find_wha?=
	=?UTF-8?Q?t_led_to_the_regression_of_outgoing_network_speed_and_each_t?=
	=?UTF-8?Q?ime_I_find_the_merge_commit_8c94ccc7cd691472461448f98e2372c7?=
	=?UTF-8?Q?5849406c?=
To: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: "Christian A. Ehrhardt" <lk@c--e.de>, niklas.neronin@linux.intel.com, 
	Linux List Kernel Mailing <linux-kernel@vger.kernel.org>, Greg KH <gregkh@linuxfoundation.org>, 
	linux-usb@vger.kernel.org
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On Tue, Feb 6, 2024 at 4:24=E2=80=AFPM Mathias Nyman
<mathias.nyman@linux.intel.com> wrote:
>
>
> This seems odd, not sure how this usb host change would impact your netwo=
rk 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 cod=
e
> 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

I confirm after reverting all listed commits and 57e153dfd0e7
performance of the network returned to theoretical maximum.

> 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?

On the good kernel I have - 32 xhci_hcd, and bad only - 4.
In both scenarios using PCI-MSIX.
I attached both interrupt output as archives to this message.

[1] https://postimg.cc/zL2RYgYZ

--=20
Best Regards,
Mike Gavrilov.

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