On 19 Nov 2009 at 11:07, Erez Zilber wrote:

> On Thu, Nov 19, 2009 at 9:38 AM, Ulrich Windl
> <ulrich.wi...@rz.uni-regensburg.de> wrote:
> > Hi!
> >
> > Wouldn't it be more obvious to calculate the average delay to a ping 
> > request?
> > (Possibly exponential average as for the system loads) (min and Max would 
> > be good
> > as well, but standard deviation probably requires use of the FPU, so that's 
> > not
> > possible in kernel modules (AFAIK)).
> 
> It's in userspace, so (almost) everything is possible. It's nice to
> have counters, average delay etc, but I want to be able to know
> exactly when bad things almost happened (i.e. timeout almost expired).
> Counters/average delay will not help me.

I thought you want to tune the timeouts. So if properly tuned, the kernel will 
log 
when when your measurements are unusual (i.e. timeout exceeded).

So what yyou really want to have (it seems) is not just a histogram of 
timeouts, 
but a history over time as well.

Ulrich

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