Re: [PATCH iwl-net] idpf: decrease statistics refresh interval

[Alexander Lobakin]

From: Danny Gonzalez <digonzal@xxxxxxxxxx>
Date: Thu, 11 Jun 2026 11:26:18 -0700

> On Thu, Jun 11, 2026 at 8:57 AM Alexander Lobakin
> <aleksander.lobakin@xxxxxxxxx> wrote:
>>
>> From: Danny Gonzalez <digonzal@xxxxxxxxxx>
>> Date: Thu, 11 Jun 2026 00:24:37 +0000
>>
>>> The default 10s statistics refresh interval is too slow for real-time
>>> monitoring and causes network selftests (e.g., uso.py) to fail when
>>> verifying traffic immediately after transmission.
>>>
>>> A 10s delay also causes aliasing in telemetry tools polling at shorter
>>> intervals (e.g., 5s), leading to inaccurate rate calculations on
>>> high-throughput NICs.
>>>
>>> Decrease the refresh interval to 250ms to ensure fresh stats and fix
>>> test failures.
>>
>> Have you tried a bit more conservate value like 1s? Wouldn't it be
>> enough for tests to pass?
>>
>> 250 ms is also okay, just curious.
> 
> Yes, 1s also allows the tests to pass.
> 
> We have a preference for 250 ms since High-Freq Telemetry (1s poll)
> 1s driver refresh rate causes aliasing:
> 
> # sar -n DEV 1 | grep eth1
> 10:52:15         eth1    390.00    339.00     51.92     55.54
> 0.00      0.00      0.00      0.00
> 10:52:16         eth1    409.00    360.00     54.72     58.64
> 0.00      0.00      0.00      0.00
> 10:52:17         eth1      0.00      0.00      0.00      0.00
> 0.00      0.00      0.00      0.00

Ack!

Reviewed-by: Alexander Lobakin <aleksander.lobakin@xxxxxxxxx>

> 
> Thanks,
> Danny

Thanks,
Olek