[ofa-general] Problem while running ib tests

[Bart Van Assche]

On Wed, Sep 23, 2009 at 11:01 AM, Moni Shoua <monis at voltaire.com> wrote:
>
> Sneha Mistry wrote:
> > I have two Dual port HCAa card.Which I have installed in
> > same PC.
> >
> > I am using OpenSuse 10.3  and installed OFED 1.4.
> >
> > 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".
> >
> > Is it an OFED related problem or Linux kernel problem.
> >
> > HCA are connected back to back and output of ibstat is as given below.
>
> 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)

An alternative for configuring CPU frequency scaling via the BIOS is
to modify the variables in /sys/devices/system/cpu/cpu0/cpufreq. This
doesn't even require a reboot.

Bart.