On Wed, Jun 03, 2015 at 07:55:58PM -0500, Christoph Lameter wrote: > I thknk the raw cycles and the rought oscillator speed are fine.
Time keeping is designed to adjust for 100's of ppm drift between clocks. A communications clock source will be spec'd to be below 200ppm in accuracy. IB clocks are below 100 ppm, and PCI-E is 300ppm (approx, I didn't check, order of magnitue is close) That translates into 0.0625 Hz. for a 312.5 MHz ethernet reference clock Compared to 5,000,000 Hz in error from rounding. So no, I disagree that rough is fine for anything. Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
