* Nicolas DICHTEL <426E06F1.9000105@xxxxxxxxx> 2005-04-26 11:16 > I set CONFIG_NET_SCH_CLK_GETTIMEOFDAY in my kernel. The macro > PSCHED_TDIFF_SAFE calculates > the difference between two timestamps and uses the function > psched_tod_diff() to do this. > If the clock is readjusted (due to ntp for example), this function can > return a negative number > (if bound > 1000000) and then the flow is blocked by the kernel. Am I > right ? do_gettimeofday takes care of ntp adjustments so we _should_ be safe, however, it might be wise to enforce a range of 0..bound instead of INT_MIN..bound because qdiscs like red are relying on this. Assuming we have a delta of -4 seconds and return -4e6 red will horribly crash when acccessing the array with idle_time>>cell_log. - : send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
