[RELENG_6] idle thread statistics not correct?

John Baldwin jhb at FreeBSD.org
Fri Aug 12 14:07:08 GMT 2005


On Friday 12 August 2005 05:38 am, Xin LI wrote:
> Hi, all,
>
> I got into a strange issue on a remote box I just upgraded to RELENG_6.
>
> [delphij at www] ~> ps aux | grep idle | grep -v grep
> root       11 92.5  0.0     0     8  ??  RL   Thu03AM   0:00.00 [idle:
> cpu3] root       13 92.5  0.0     0     8  ??  RL   Thu03AM 2293:59.13
> [idle: cpu1] root       12 70.7  0.0     0     8  ??  RL   Thu03AM
> 2300:52.77 [idle: cpu2] root       14 27.8  0.0     0     8  ??  RL  
> Thu03AM 2292:59.84 [idle: cpu0]
>
> However, if I set machdep.hlt_logical_cpus=0, the ps aux output looks more
> rational:
>
> [delphij at www] ~> ps aux | grep idle | grep -v grep
> root       11 92.5  0.0     0     8  ??  RL   Thu03AM 2307:08.09 [idle:
> cpu3] root       13 81.2  0.0     0     8  ??  RL   Thu03AM 2306:58.61
> [idle: cpu1] root       12 57.1  0.0     0     8  ??  RL   Thu03AM
> 2304:56.66 [idle: cpu2] root       14 39.1  0.0     0     8  ??  RL  
> Thu03AM 2294:48.68 [idle: cpu0]
>
> I have not looked into this deeply yet, but I think this really looks weird
> and may indicate other issues.

[ Grrr, stupid kmail "smart" quoting always screws up formatted output, wish I 
could turn it off ]

The idle CPUs are idle in such a way that they don't update their stats is 
all.  It's not an indication of any other issues, it's simply an accounting 
error in that one edge case.  I can look into fixing it but since it's just 
cosmetic, it's fairly low on the priority list.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org


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