FEC linux driver and RAM memory consumption

ludoviclaboureu — Thu, 23 May 2019 16:11:04 GMT

Hello community,

We are working on NXP confidential Soc similar to imX7: Dual-Cortex A7/Cortex-M4. Our board has only 128 MiB of DDR.

We are using the FEC (Ethernet BroadR-Reach) on Cortex-A7 under Linux.

We are using linux4.9.y from mainstream with support for this chip.

Your current version is linux 4.9.165.

The FEC driver (drivers/net/ethernet/freescale/fec_main.c,fec.h,fec_ptp.c) is taken from this version mainstream with only very simple modifications in dtb tables to support our chip (+3 lines).

“.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_GBIT,”

We encounter memory issue with this driver. It uses 2 MiB at startup (acceptable) but the consuming of DDR (MemAvailable in /proc/meminfo) increases continusly only when ethernet interface is loaded (RTP audio streaming ...) . It depends on the use case selected but we can reach out of memory on DDR, so reset.

What are the consumers of RAM in this driver ?

How to monitore the RAM consumers (IP stack ..) of FEC driver ?

Is it possible to reduce or limit memory usage ?

Thank you in advance for advices

Ludovic

CC : @didier.leymarie@continental-corporation.com

Re: FEC linux driver and RAM memory consumption

gusarambula — Wed, 05 Jun 2019 16:45:19 GMT

Hello Ludovic,

My apologies for the delay. I would need to ask you to please contact for FAE who will be able to provide better and more expedited support on this regard.

Please let me know if you have any problems contacting your FAE.

Regards,

Re: FEC linux driver and RAM memory consumption

dgriffin65 — Wed, 19 Feb 2020 18:56:47 GMT

Has this issue been resolved? I am having a very similar problem with the iMX1050.

Thanks,

Doug

topic FEC linux driver and RAM memory consumption in i.MX Processors

FEC linux driver and RAM memory consumption

Re: FEC linux driver and RAM memory consumption

Re: FEC linux driver and RAM memory consumption