On 07/28/2010 12:00 AM, Arjan Koers wrote:
On 2010-07-26 20:59, Arjan Koers wrote:
I ran into the same problem. 2.6.34.1 and 2.6.35-rc6 SMP guest
kernels hang during boot.
It appears that last is way ahead of ret twice.
The kernel boots with this debug patch that makes the clock go
backwards if the difference is big:
last = atomic64_read(&last_value);
do {
- if (ret< last)
- return last;
+ if (ret< last) {
+ if ( last - ret< 25000000 )
+ return last;
+ else
+ printk("pvclock backwards: ret = %llx; last = %llx\n", ret, last);
+ }
last = atomic64_cmpxchg(&last_value, last, ret);
} while (unlikely(last != ret));
[ 0.037122] Total of 2 processors activated (11198.08 BogoMIPS).
[ 0.037118] x86 PAT enabled: cpu 1, old 0x0, new 0x7010600070106
[ 0.040000] pvclock backwards: ret = 108373705fe2; last = 210aff61470a
Zaaaacchhhh?!
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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