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>> > <4>CPU1<T0:1339376,T1:446448,D:8,S:446460,C:1339380> >> > <4>checking TSC synchronization across CPUs: passed. >> > <4>Waiting on wait_init_idle (map = 0x2) >> > <4>All processors have done init_idle >> > >> > I would say this means the TSC skew fix is broken and shooting down >> > your box. What do you think, Alan? >> >> Seems a reasonable guess. However that TSC skew itself may point to other >> problems. It means one processor started running successfully a little >> after the other. That might be normal behaviour for that board or might >> point to something else > > It seems no normal behaviour, I checked several other boards of this type > and none had a TSC skew (and all work). Purely guessing I would suggest > two try some other 2 processors to verify the behaviour is really > processor-independent. Another guess would of course be the MB itself > being broken to some extent. > > Has anybody ever seen a _working_ skew correction? Is this known-to-work > code? Yes. Works every time for me (on NUMA-Q), with huge corrections: checking TSC synchronization across CPUs: BIOS BUG: CPU#0 improperly initialized, has 6571 usecs TSC skew! FIXED. BIOS BUG: CPU#1 improperly initialized, has 6571 usecs TSC skew! FIXED. BIOS BUG: CPU#2 improperly initialized, has 6571 usecs TSC skew! FIXED. BIOS BUG: CPU#3 improperly initialized, has 6571 usecs TSC skew! FIXED. BIOS BUG: CPU#4 improperly initialized, has 20664 usecs TSC skew! FIXED. BIOS BUG: CPU#5 improperly initialized, has 20664 usecs TSC skew! FIXED. BIOS BUG: CPU#6 improperly initialized, has 20665 usecs TSC skew! FIXED. BIOS BUG: CPU#7 improperly initialized, has 20664 usecs TSC skew! FIXED. BIOS BUG: CPU#8 improperly initialized, has -4424 usecs TSC skew! FIXED. BIOS BUG: CPU#9 improperly initialized, has -4424 usecs TSC skew! FIXED. BIOS BUG: CPU#10 improperly initialized, has -4424 usecs TSC skew! FIXED. BIOS BUG: CPU#11 improperly initialized, has -4424 usecs TSC skew! FIXED. BIOS BUG: CPU#12 improperly initialized, has -22812 usecs TSC skew! FIXED. BIOS BUG: CPU#13 improperly initialized, has -22812 usecs TSC skew! FIXED. BIOS BUG: CPU#14 improperly initialized, has -22812 usecs TSC skew! FIXED. BIOS BUG: CPU#15 improperly initialized, has -22811 usecs TSC skew! FIXED. I did try disabling it once, which stopped the system booting. I never looked at it any further. If you are crashing near the wait_init_idle fix, you might try Ingo's scheduler patch - it has a different way of fixing this race condition. M. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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