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: Fri, 2 Feb 2024 18:32:59 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
Cc: Randy Dunlap <rdunlap@...radead.org>, Linux List Kernel Mailing
 <linux-kernel@...r.kernel.org>, Greg KH <gregkh@...uxfoundation.org>,
 Network Development <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

Thanks for the forward!

On Fri, 2 Feb 2024 17:16:41 -0800 Randy Dunlap wrote:
> >> When I copy files from one computer to another and kernel snapshot
> >> builded from commit 296455ade1fd I have 97-110MB/sec which is almost
> >> max speed of 1Gbps link.
> >> When I move to commit 9d1694dc91ce I have only 66-70MB/sec which is
> >> significantly slower.

There isn't that much networking in between the two.
Is any of the CPU cores at 100% when you are transferring the data on
the bad commit?
Do you have any iptables / nftables rules?
Are you using TLS in the transfer?
Did you try reverting f1172f3ee3a98754?