On 7/24/19 3:28 AM, Tom Prohaszka wrote: > We implemented the MCP25xxfd driver patch V7 and are experiencing an > issue when the CPU load for the mcp25xxfd driver is over 30%. Using > CANDump or our custom application, we see: > > root@ccimx6ulcvdp:~/tmp# BUG: using __this_cpu_add() in preemptible > [00000000] code: irq/194-mcp25xx/805 Do you have a full OOPS/backtrace for this? > When this occurs, the kernel eventually crashes. Has this been seen > by anyone, or any suggestions on what could cause this? > > Our system is: > CAN 2.0 Std, 500Kbps, Tx/Rx enabled, but only Receiving CAN messages > Digi Imx6ul, > MCP2517 clk 40Mhz > SPI Clk 12 Mhz > Linux version 4.9.65-dey+gf832589 (gcc version 6.2.0 (GCC) ) #41 SMP > PREEMPT Sun Jul 7 21:39:25 EDT 2019 > > On a secondary question, in the driver comments, it was mentioned that > transfer rate was >99% with no network statistics, but when network > statistics are used, the transfer rate drops 60%. > We don't care about network statistics, can you provide info on how > you turned this off? Adding Martin on Cc. Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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