[ofa-general] Problem while running ib tests

[Ira Weiny]

On Wed, 23 Sep 2009 09:11:49 -0600
Jason Gunthorpe <jgunthorpe at obsidianresearch.com> wrote:

> On Wed, Sep 23, 2009 at 12:01:02PM +0300, Moni Shoua wrote:
> 
> > > If I try to run any IB bandwidth test or latency test it end us with warning
> > > "Conflicting CPU frequency values detected: 2394.000000 != 1596.000000".
> 
> > One more option to solve it (besides the -F) is to disable the power
> > saving of the CPU.  In the power saving mode not all CPUs operate at
> > the same Hz/sec rate (cycle rate) and this is the reason for the
> > conflict.  Disabling the power saving mode is done in the BIOS and
> > it is sometimes called economy mode or performance mode (the other
> > side of the trade off)
> 
> This whole thing should just be removed. x86-64 linux has a VDSO
> clock_gettime(CLOCK_MONOTONIC) that is fast, doesn't trap into the
> kernel, and doesn't suffer from these problems.

What about other architectures?  I would be willing to do a quick patch but...

Ira

> 
> Jason
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-- 
Ira Weiny
Math Programmer/Computer Scientist
Lawrence Livermore National Lab
925-423-8008
weiny2 at llnl.gov