* Dong, Eddie (eddie.d...@intel.com) wrote: > > > > > > A question here, the packet comparing may be very tricky. For example, > > > some protocol use random data to generate unpredictable id or > > > something else. One example is ipv6_select_ident() in Linux. So COLO > > > needs a mechanism to make sure PVM and SVM can generate same random > > data? > > > > > Good question, the random data connection is a big problem for COLO. At > > present, it will trigger checkpoint processing because of the different > > random > > data. > > I don't think any mechanisms can assure two different machines generate the > > same random data. If you have any ideas, pls tell us :) > > > > Frequent checkpoint can handle this scenario, but maybe will cause the > > performance poor. :( > > > The assumption is that, after VM checkpoint, SVM and PVM have identical > internal state, so the pattern used to generate random data has high > possibility to generate identical data at short time, at least...
They do diverge pretty quickly though; I have simple examples which reliably cause a checkpoint because of simple randomness in applications. Dave > Thx Eddie > -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
