So... I have a PV+PVSHIM DOMU running a pretty recent 9.x on a DOM0 running a 9.99.xx kernel. The DOM0 is not large, a 4 processor E-2224 with 32GB of memory. The DOMU has 2 VCPUs and 8GB of memory. About every day a very particular DOMU tosses the:
WARNING: negative runtime; monotonic clock has gone backwards on its console and sort of falls of the network. A reboot "fixes" it, but nothing else does. The DOM0 is running a mostly stock XEN3_DOM0 kernel except that IFQ_MAXLEN is larger than the default and HZ is 2000 (which helped to keep the clocks on the DOMU syncing properly all other things being equal). The DOMU is running a pretty stock XEN3_DOMU, that is, HZ is 100 there. Over the years, this problem has been mentioned from time to time, but I was wondering if anyone has a actual solution to this sort of thing. The DOM0 hosts a small number of guests, all PV+PVSHIM, but this one in particular is the only one with 2 VCPUs, all the rest have only 1 and have never exhibited the problem of the clock going backwards. Nothing much is really going on with the DOMU right now, as it is one of my build guests. It is running ZFS and does backups each day and does a 'cvs update' sort of thing from time to time, but than that is it right now. Any thoughts?? -- Brad Spencer - b...@anduin.eldar.org - KC8VKS - http://anduin.eldar.org