topic Re: nitrogen6lite stall and cpu load in i.MX Processors

nitrogen6lite stall and cpu load

jarmok — Thu, 22 Aug 2013 11:06:52 GMT

Hi,

I am experiencing following two problems with My nitrogen6lite board - anyone else has experienced similar problems? I am using boundary devices kernel and custom rootfs.

1. When running from SD Card and starting for example new applications, the system occasionally stalls for something like 5 seconds after which it continues normally and application starts. For

Me this looks like I/O problems of some kind but not sure?

2. Load average on completely idle device (all user mode processes killed) seem somehow strangely high. E.g.

CPU: 0% usr 0% sys 0% nic 99% idle 0% io 0% irq 0% sirq

Load average: 2.03 1.24 0.53 1/50 1415

As far as I understood, the load average should fall close to zero (no processes run queue waiting for execution), right?

I also made similar findings with SabreLite (quad core) where the Load average was somewhere near 4.

Re: nitrogen6lite stall and cpu load

admin — Tue, 10 Dec 2013 21:05:52 GMT

pejmankalkhoran

Hi Pejman, can you please answer this question of an issue that is occurring on the Nitrogen 6Lite and SabreLite boards? Thanks.

Re: nitrogen6lite stall and cpu load

YixingKong — Wed, 18 Dec 2013 06:43:33 GMT

pejmankalkhoran, are you able to help the customer's question?
Thanks,

Yixing

Re: nitrogen6lite stall and cpu load

admin — Wed, 15 Jan 2014 15:23:22 GMT

pejmankalkhoran, TroyKisky, EricNelson, robertwinkler

Can anyone at Boundary Devices help with this issue? Thanks!

Re: nitrogen6lite stall and cpu load

EricNelson — Wed, 15 Jan 2014 15:31:35 GMT

Hi Jarmo,

To answer question 1, we really need to know what userspace you're using. We have seen some issues with delays on Debian or Ubuntu which appear related to excessive disk I/O. In particular, if command-line completion is invoked using the "Tab" key, the system will appear to stall while a large number of directories are searched. Do you have some specific examples of when things appear to stall?

I don't understand question 2. The way I'm reading the output is that the load is zero. I assume that you're questioning the "Load average" numbers, but I'm not sure how to interpret them.

Re: nitrogen6lite stall and cpu load

EricNelson — Wed, 15 Jan 2014 15:31:50 GMT

Thanks for the ping, Grant.