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Fixed

LIN7-2368 : On WRL7 ARM BSP fsl-ls10xx - target twr-ls1021a , the thread irq/126-mmc0 take too much cpu time

Created: Dec 8, 2014 Updated: Mar 4, 2016

Resolved Date: Dec 17, 2014

Found In Version: 7.0

Fix Version: 7.0

Severity: Standard

Applicable for: Wind River Linux 7

Component/s: BSP

Description

On WRL7 ARM BSP fsl-ls10xx - target twr-ls1021a , the thread irq/126-mmc0 take too much cpu time as follows:

Cpu(s):  2.5%us, 51.5%sy,  0.0%ni, 39.2%id,  0.3%wa,  0.0%hi,  6.5%si,  0.0%st
Mem:    998672k total,   186672k used,   812000k free,        0k buffers
Swap:        0k total,        0k used,        0k free,    60800k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
   85 root     -51   0     0    0    0 S   12  0.0   0:07.76 [irq/126-mmc0]

Steps to Reproduce

1. configure and build project

configure --enable-board=fsl-ls10xx --enable-kernel=preempt-rt --enable-rootfs=glibc_std --enable-test --enable-jobs=8 --enable-parallel-pkgbuilds=8

2. boot the target twr-ls1021a and check the usage of cpu time with "top"