DI BACCO ANTONIO - technolabs wrote: > I have two different boards: one with MPC875 running at 66 MHz cpu/66 > MHz bus, one with MPC880 running at 132 MHz cpu /66MHz bus, I load the > same kernel and root file system on both the boards that have only > different u-boot(s). > > If I do a ping 127.0.0.1 on the MPC875 I get a round trip of 0.300 ms, > while on the other one I get 0.900 ms, I expected the opposite. > > Could be an issue with memory configuration? In the formula to calculate > the PTx on the MPC885RM manual I used 66 MHz as "system clock" for the > first board and 132 MHz for the second board. Probably this is a mistake > because "system clock" should be the bus clock but how this can so > adversely affect the ping round trip?
Are you sure the timebase clock is what the kernel thinks it is? Does the time-of-day clock progress at the correct rate? -Scott _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
