http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1008

Summary: domU's clock jumps forward (XEN 3.1) in SLES10 HVM Product: Xen Version: unspecified Platform: x86-64 OS/Version: Linux-2.6 Status: NEW Severity: major Priority: P2 Component: Hypervisor AssignedTo: xen-...@lists.xensource.com ReportedBy: luka...@yandex.ru

Running SLES10 32bit in HVM domU shows significant unexpected time jumps in domU. Sometimes time jumps a minute forward or even more, sometimes clock seems to step normally.

Environment and steps to reproduce: SUN X4600 server with 8 cpus and 32gb of mem. SLES9.3 64bit as dom0 OS. XEN 3.1 64bit is installed over SLES9.3 - either from sources or binary. dom0's uname is 2.6.18-xen SMP x86_64 x86_64 x86_64 GNU/Linux Boot from SLES10-32bit installation DVD in resque mode (uname is 2.6.16.21-0.8-default). Login as root with no password and execute: # yes 'sleep 1; date' | bash Note time stepping difference - often it jumps far more than 1 seconds.

If I try to install SLES10-32bit domU's Linux distribution often hangs. Sometimes it just fails leaving in its "dmesg" complaints abouts DMA timeouts and so domU's local "disk" write ops failed. Other symptoms become apparent when I managed to install SLES10 in a domU (once): 1) Text login screen becomes dark very fast - it must be timeout occurs which blanks screen. Pressing SHIFT turns it on again just for a few seconds. 2) Sometimes, when one types 'root' at the 'Login:' prompt, and then immediately types password, SLES10 denies login and says: timeout is over (to type password), making me typing password VERY promptly!

This domU clock effect depends of domU's OS. Windows98 and other linuxes I tried show no such effect. Only SLES10 32bit DVD distributive could not be even installed because of clock jumps!