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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Message-ID: <a026ecd8-6fba-017d-d673-0d0759a37ed8@linux.intel.com>
Date: Thu, 8 Feb 2024 17:43:44 +0200
From: Mathias Nyman <mathias.nyman@...ux.intel.com>
To: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
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
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 8.2.2024 12.32, Mikhail Gavrilov wrote:
> On Thu, Feb 8, 2024 at 2:23 PM Mathias Nyman
> <mathias.nyman@...ux.intel.com> wrote:
>>
>> My guess is that CPU0 spends more time with interrupts disabled than other CPUs.
>> Either because it's handling interrupts from some other hardware, or running
>> code that disables interrupts (for example kernel code inside spin_lock_irq),
>> and thus not able to handle network adapter interrupts at the same rate as CPU23
>>
> 
> Can this be fixed?

Not sure, I'm not that familiar with this area.
Maybe running irqbalance could help?

Thanks
Mathias