Bug 217640

Summary:	10G SFP+ work at 3.41 Gbits/sec on multiple hardware
Product:	Networking	Reporter:	alpha_one_x86
Component:	Other	Assignee:	Stephen Hemminger (stephen)
Status:	REOPENED ---
Severity:	high	CC:	bagasdotme
Priority:	P3
Hardware:	All
OS:	Linux
Kernel Version:		Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	dmesg lspci

Description alpha_one_x86 2023-07-06 23:23:02 UTC

Hi,
Since I upgrade linux kernel from 5.10.137 to 6.1.38 all my interface of macchiatobin work at 100M (90 Mbits/sec detected by iperf)
ethtool detect the link at correct speed (10G for SFP+ and 1Gbps for ethernet)
What can be the regression?

Comment 1 Bagas Sanjaya 2023-07-06 23:54:52 UTC

(In reply to alpha_one_x86 from comment #0)
> Hi,
> Since I upgrade linux kernel from 5.10.137 to 6.1.38 all my interface of
> macchiatobin work at 100M (90 Mbits/sec detected by iperf)
> ethtool detect the link at correct speed (10G for SFP+ and 1Gbps for
> ethernet)
> What can be the regression?

Where is your dmesg? And lspci?

Also, and the most important, can you do bisection to find the culprit? Please
refer to Documentation/admin-guide/bug-bisect.rst for how.

Comment 2 alpha_one_x86 2023-07-07 00:21:38 UTC

Created attachment 304557 [details]
dmesg

Comment 3 alpha_one_x86 2023-07-07 00:22:01 UTC

Created attachment 304558 [details]
lspci

Comment 4 alpha_one_x86 2023-07-07 00:23:42 UTC

I doing bisect, but will take me a time

Comment 5 alpha_one_x86 2023-07-07 12:07:27 UTC

The problem was fix on reboot, then very hard to reproduce if I need wait month to bug

Comment 6 Willy Tarreau 2023-07-07 15:07:17 UTC

If that can help with your bisect, mine which is still on 5.15.109 has never exhibited this problem. I expected to upgrade to 6.1 soon, if I encounter it I'll update this entry.

Comment 7 alpha_one_x86 2023-07-07 15:51:07 UTC

I use eth2, eth1, eth3, or SPF+ SFP and ethernet, and you?

Comment 8 alpha_one_x86 2023-07-25 11:03:53 UTC

Any one is able to do speedtest at 10G via SFP+? I have unstable rate around 3.26 Gbits/sec.

Strangely I have same speed limit (3.41Gbits/sec very stable) into core Intel Core i5-12400 with Intel Corporation Ethernet Controller X710/Broadcom Inc. and subsidiaries NetXtreme II BCM57810 in my usage (with fresh install all worked at 10G with iperf3)

Then I reopen this bug, now I have more time to diag it, but how detect the problem?