Re: [Intel-wired-lan] Supermicro AOC-STGN-I1S (Intel 82599EN based 10G adapter) - poor network perfomance after moving to Debian 11.5

[Paul Menzel <pmenzel@molgen.mpg.de>]

Dear Bartek,


Am 19.01.23 um 18:17 schrieb Bartek Kois:
> W dniu 19.01.2023 o 18:09, Paul Menzel pisze:

>> Am 19.01.23 um 17:58 schrieb Bartek Kois:
>>> W dniu 19.01.2023 o 13:24, Bartek Kois pisze:
>>>>
>>>> W dniu 19.01.2023 o 11:17, Paul Menzel pisze:
>>>>>
>>>>> #regzbot ^introduced: 4.9.88..5.10.149
>>
>>>>> Am 14.01.23 um 11:23 schrieb Bartek Kois:
>>>>>
>>>>>> After moving from Debian 9.7 to 11.5 as soon as I perform "ip link 
>>>>>> set enp1s0 up" for my 10G adapter (AOC-STGN-I1S - Intel 82599EN 
>>>>>> based 10G adapter) I am experiencing high cpu load (even if no 
>>>>>> traffic is passing through the adapter) and network performance is 
>>>>>> low (when network is connected).
>>>>>
>>>>> How do you test the network performance? Please give exact numbers 
>>>>> for comparison.
>>>>>
>>>> I am using this server as a router for my subscribers with iptables 
>>>> (for NAT and firewall) and hfsc (for QoS). First I encountered this 
>>>> problem while migrating form Debian 9.7 to 11.5. Routers based  on 
>>>> Supermicro X11SSL-F (Intel® C232 chipset) works with no problems 
>>>> after that migration, but routers based on Supermicro X9SCL (Intel 
>>>> C202 PCH) and Supermicro X10SLL+-F (Intel C222 Express PCH) starts 
>>>> behaving strangely with high cpu load (0.5-0.8 while before it was 
>>>> around 0.0-0.1) and subscribers not being able to utilize their 
>>>> plans. I tried to strip down the problem and ends up with clean 
>>>> system with no iptables or hfsc rules behaving the same (higher 
>>>> load) right after setting the 10G link upeven if no traffic is 
>>>> passing by.
>>>>
>>>>>> The cpu load is oscillating between 0.1 and 0.3 on vanilla system
>>>>>> with no network attached. The problem can be observed on the 
>>>>>> following platforms: Supermicro X9SCL (Intel C202 PCH) and
>>>>>> Supermicro X10SLL+-F (Intel C222 Express PCH), but for the Supermicro
>>>>>> X11SSL-F (Intel® C232 chipset) everything is working well.
>>>>>>
>>>>>> Tested environments:
>>>>>> Debian 9.7 - Linux 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1+deb9u1 
>>>>>> (2018-05-07) x86_64 GNU/Linux [all platforms working well with no 
>>>>>> problems: Supermicro X9SCL (Intel C202 PCH), Supermicro X10SLL+-F 
>>>>>> (Intel C222 Express PCH), Supermicro X11SSL-F (Intel® C232 chipset)]
>>>>>
>>>>>> Debian 11.5 - Linux 5.10.0-19-amd64 #1 SMP Debian 5.10.149-2 
>>>>>> (2022-10-21) x86_64 GNU/Linux [older platforms: Supermicro X9SCL 
>>>>>> (Intel C202 PCH), Supermicro X10SLL+-F (Intel C222 Express PCH) 
>>>>>> behave problematic as described above | newer platform: Supermicro 
>>>>>> X11SSL-F (Intel® C232 chipset) working well with no problems]
>>>>>
>>>>> Maybe create a bug at the Linux kernel bug tracker [1], where you 
>>>>> can attach all the logs (`dmesg`, `lspci -nnk -s …`, …).
>>>>>
>>>> I`ve already reported that to the Debian team 
>>>> ttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1024763, but so far 
>>>> nobody took care of this issue so far.
>>>>
>>>>>> So far to solve the problem I was trying to upgrade system to the 
>>>>>> newest stable version, upgrade kernel to version 6.x, upgrade 
>>>>>> ixgbe driver to the newest version but with no luck.
>>>>>
>>>>> Thank you for checking that. Too bad it’s still present. To rule 
>>>>> out some user space problem, could you test Debian 9.7 with a 
>>>>> stable Linux release, currently 6.1.7?
>>>>>
>>>>> What does `sudo perf top --sort comm,dso` show, where the time is 
>>>>> spent?
>>>>
>>>> During my first test in real enviroment with subscribers I gether 
>>>> the following data through the perf:
>>>>
>>>>   27.83%  [kernel]                   [k] strncpy
>>>>   14.80%  [kernel]                   [k] nft_do_chain
>>>>    7.61%  [kernel]                   [k] memcmp
>>>>    5.63%  [kernel]                   [k] nft_meta_get_eval
>>>>    3.14%  [kernel]                   [k] nft_cmp_eval
>>>>    2.79%  [kernel]                   [k] asm_exc_nmi
>>>>    1.07%  [kernel]                   [k] module_get_kallsym
>>>>    0.92%  [kernel]                   [k] kallsyms_expand_symbol.constprop.0
>>>>    0.85%  [kernel]                   [k] ixgbe_poll
>>>>    0.75%  [kernel]                   [k] format_decode
>>>>    0.61%  [kernel]                   [k] number
>>>>    0.56%  [kernel]                   [k] menu_select
>>>>    0.54%  [kernel]                   [k] clflush_cache_range
>>>>    0.52%  [kernel]                   [k] cpuidle_enter_state
>>>>    0.51%  [kernel]                   [k] vsnprintf
>>>>    0.50%  [kernel]                   [k] u32_classify
>>>>    0.49%  [kernel]                   [k] fib_table_lookup
>>>>    0.40%  [kernel]                   [k] dma_pte_clear_level
>>>>    0.39%  [kernel]                   [k] domain_mapping
>>>>    0.36%  [kernel]                   [k] ixgbe_xmit_fram
>>>>
>>>>
>>>>     PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM TIME+ COMMAND
>>>>      18 root      20   0       0      0      0 S  28.2   0.0 7:06.27 ksoftirqd/1
>>>>      12 root      20   0       0      0      0 R  12.0   0.0 4:10.88 ksoftirqd/0
>>
>> […]
>>
>> Do you see different behavior in `/proc/interrupts`?
>>
> This is how it looks like for Debian 11.5 - Linux 5.10.0-19-amd64 #1 SMP 
> Debian 5.10.149-2 (2022-10-21) x86_64 GNU/Linux on Supermicro X10SLL+-F 
> (Intel C222 Express PCH):
> 
>        1 root      20   0  163948  10288   7696 S   0.0   0.1 0:39.58 systemd

[…]

The content of `/proc/interrupts` has a different format on my system.

```
$ head -3 /proc/interrupts
            CPU0       CPU1       CPU2       CPU3
   1:      55560          0        113          0  IR-IO-APIC   1-edge 
    i8042
   8:          0          0          0          0  IR-IO-APIC   8-edge 
    rtc0
```
[…]

> and for Debian 9.7 - Linux 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1+deb9u1 
> on Supermicro X10SLL+-F (Intel C222 Express PCH)
> 
> 31659 root      20   0       0      0      0 S   0.3  0.0 0:00.92 
> kworker/7:0
>      1 root      20   0   57032   6736   5256 S   0.0  0.1 2:28.14 systemd

[…]
>>>>>> Supermicro support suggested as follows:
>>>>>> it might be kernel related debian 11.5 has kernel 5.10 which is a 
>>>>>> recent kernel it might not properly support the chipsets for X9 
>>>>>> therefore i suggest to use RHEL or CentOS as they use much older 
>>>>>> kernel versions. I expect that with ubuntu 20.04 you see the same 
>>>>>> problem it uses kernel 5.4
>>>>> >>> Testing another GNU/Linux distribution for another data point, 
>>>>> might
>>>>> be a good idea.
>>>>>
>>>>> As nobody has responded yet, bisecting the issue is probably the 
>>>>> fastest way to get to the bottom of this. Luckily the problem seems 
>>>>> reproducible and you seem to be able to build a Linux kernel 
>>>>> yourself, so that should work. (For testing purposes you could also 
>>>>> test with Ubuntu, as they provide Linux kernel builds for (almost) 
>>>>> all releases in their Linux kernel mainline PPA [2].)
>>>>>
>>>> Of course  I can try Ubuntu and report how it is working.
>>>>
>>> Ubuntu (5.15.0-43-generic) seems to be working in the same way 
>>> generating higher load after executing "ip link set enp1s0 up".
>>
>> That is good to know. (Is this Ubuntu 22.04?) What about Ubuntu 20.04 
>> with Linux 5.4, and Ubuntu 18.04 with 4.15?
>>
>> Anyway, I think, you won’t come around bisecting. Another hint, make 
>> sure that you can build a 4.9 Linux kernel yourself, that does not 
>> exhibit that issue.
>>
> That`s right, it is 22.04. I don`t have to build it. Standard kernel 
> Linux 4.9.0-6-amd64 from Debian 9.7 worked without problems for past 4 
> years.

If nobody of the developers/maintainers is going to step up, you are on 
your own. Again, as you can reproduce this easily, the fastest way is to 
bisect the issue, which you can do on your own.


Kind regards,

Paul


>>>>> [1]: https://bugzilla.kernel.org/
>>>>> [2]: https://kernel.ubuntu.com/~kernel-ppa/mainline/