netdev - Re: [net-next 6/6] can: mcp251xfd: mcp251xfd_regmap_crc_read(): work around broken CRC on TBC register

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Date:   Mon, 10 May 2021 09:45:55 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Patrick Menschel <menschel.p@...teo.de>
Cc:     Drew Fustini <drew@...gleboard.org>, netdev@...r.kernel.org,
        linux-can@...r.kernel.org, Will C <will@...china.cc>
Subject: Re: [net-next 6/6] can: mcp251xfd: mcp251xfd_regmap_crc_read(): work
 around broken CRC on TBC register

On 09.05.2021 07:46:20, Patrick Menschel wrote:
> > Do I have to change my test?
> 
> I changed my test to 1 hour and removed the sleep statement.
> Still no measurable difference for performance and no CRC Errors with
> both kernels.

See other mail about my thoughts about performance and CRC.

> Apparently the test is hard on the CPU, I have two pytest processes
> listed in htop one with 80%CPU and one with 60% CPU, approx 30% ram
> usage of 512MB. I have no clue how it reaches the CPU values, there
> should be only one CPU on the pi0w.

Interesting :)

> ### 5.10.17+ on pi0w ###
> 
> 2021-05-09 08:02:56 [    INFO] 725649 frames in 1:00:00
> (test_socketcan.py:890)
> 
> ### 5.10.31-performance-backports+ on pi0w ###
> 
> 2021-05-09 09:13:32 [    INFO] 715936 frames in 1:00:00
> (test_socketcan.py:890)
> 
> I'll switch boards to a pi3b and test again with these settings.

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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