On 4/22/2013 2:51 AM, Tommy Apel wrote: > Stan> > That was exactly what I was trying to show, that you result may vary > depending on data and backing device, as far as the raid1 goes it > doesn't care much for the data beeing passed through it. As I mentioned, this is true of the SandForce 2nd gen ASICs, maybe some others. The Samsung SSDs use a home grown Samsung controller which doesn't do compression. Its performance doesn't vary due to data content. Thus the performance gap you demonstrated doesn't apply to Andrei. We can eliminate this as a possible cause of his apparently horrible performance. And I think we can eliminate the regression in 2.6.32 as that patch seems to be included in his kernel, otherwise he'd likely not get 260MB/s in his dd raw read tests. The mystery continues... -- Stan -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
