On Tue, Nov 30, 2010 at 09:45:15PM -0600, Rich Graves wrote: > Under the resolved topic "rhel6 xenU on rhel5.5 domU - no console," "Pasi > Kärkkäinen" <[email protected]> asked: > > > Did you file a bugzilla entry about the live migration issue? > > Still no, but I might have the answer. I just don't like it. > > My DNS/network issues were a red herring, caused a bug in our > McAfee/Sidewinder firewall. RHEL6 sends back-to-back A and AAAA queries in > separate packets, and the Sidewinder's DNS proxy only passes the former. > Other OSes either send two queries in one packet or don't send them > back-to-back with sequential TXIDs. However, one real problem with Xen > live-migrate remains. > > It could be due to processor flags. I can fairly consistently migrate a guest > from a X5680 processor (Nehalem2 Westmere) to a L5520 (original Nehalem), and > usually from a 5160 (Core2 Duo) to a 5060 (Core Duo), but not the other way > around. > > In contrast, all of my RHEL4 and RHEL5 guests are able to move *anywhere*, > even between the 5060 and 5680, as long as basic things like NX are set the > same in BIOS. Maybe the problem is that the newer RHEL6 kernel is too smart > for its own good? Can I mask the newest flags somehow? > > The processor flags are: > > X5680 > flags : fpu tsc msr pae cx8 apic mtrr cmov pat clflush acpi mmx > fxsr sse sse2 ss ht syscall nx lm constant_tsc ida arat pni est ssse3 cx16 > sse4_1 sse4_2 popcnt lahf_lm > > X5520 > flags : fpu tsc msr pae cx8 apic mtrr cmov pat clflush acpi mmx > fxsr sse sse2 ss ht syscall nx lm constant_tsc ida pni est ssse3 cx16 sse4_1 > sse4_2 popcnt lahf_lm > > 5060 > flags : fpu tsc msr pae cx8 apic mtrr cmov pat clflush acpi mmx > fxsr sse sse2 ss ht syscall nx lm constant_tsc pni cid cx16 lahf_lm > > 5160 > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca > cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm > constant_tsc pni monitor ds_cpl est tm2 xtpr >
Xen has support for cpuid masking, but I'm not sure if EL5 Xen has that.. ie. it's at least in newer Xen versions. -- Pasi _______________________________________________ rhelv6-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv6-list
