[openib-general] Re: Re: Userspace testing results (manykernels, many svn trees)

[Michael S. Tsirkin]

Quoting r. Nishanth Aravamudan <nacc at us.ibm.com>:
> Subject: Re: [openib-general] Re: Re: Userspace testing results (manykernels, many svn trees)
> 
> On 24.01.2006 [21:39:23 +0200], Michael S. Tsirkin wrote:
> > Quoting r. Roland Dreier <rdreier at cisco.com>:
> > > Subject: Re: [openib-general] Re: Re: Userspace testing results (manykernels, many svn trees)
> > > 
> > >     Michael> 1 sec = 5.37731e+14 usec
> > > 
> > >     Michael> which seems to indicate something's still wrong.
> > > 
> > > BTW this number is pretty close to 2^32 times bigger than 1e6, so the
> > > problem is probably still using long long to return the result of
> > > mftb (which will result in shifting the result by 32 bits, ie
> > > multiplying by 2^32).
> > 
> > Hmm.
> > Maybe make clean wasnt run after updating?
> > Could it be un on rev 5174?
> 
> Heh, here's what happens with 5174:
> 
> Correlation coefficient r^2: 0.773428 < 0.9
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 1 sec = inf usec
> 
> And so forth...
> 
> Thanks,
> Nish

Hmm. Looks like mftb is returning wrong data.
Could you uncomment lines setting DEBUG and DEBUG_DATA at the top?
This will print all mftb values out.

> 
> P.S. Is there any way to specify how long to run clock_test from the
> command line? It's a bit of a pain the grid to kill a process...
> 
> Thanks,
> Nish

I'll make something up, for now I guess you can just add a hard-coded
counter in for(;;) in clock_test.c

-- 
MST