kernel virtual machine / Bugs / #291 gettimeofday goes backward

#291 gettimeofday goes backward

Status: closed

Owner: nobody

Labels: intel (43)

Priority: 5

Updated: 2012-10-09

Created: 2008-07-23

Creator: Rafal Wijata

Private: No

kvm version: 71
host: rhel51 2.6.18-92.1.6.el5 64bit 16G RAM, 8CPU
guest: rhel51 2.6.18-92.1.6.el5 64bit, 3.5G ram, 2 CPU
guest run as: qemu-system-x86_64 $DEVICES -m $MEM -smp $CPUS -net nic,macaddr=$MAC,model=e1000 -net tap,script=./ifup -nographic -daemonize

in the guest executed two consecutive gettimeofday (boost::ptime in fact), the latter returned time smaller than first
(2008-Jul-22 16:34:15.477000, 2008-Jul-22 16:34:15.470000)

I'm sure no time change was made(like rdate or ntpdate) on neither host or guest. No time-releated options were passed to kernel(host or guest)

Any workaround?

Discussion

Joerg Roedel - 2008-09-02

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Originator: NO

Is the host an AMD or an Intel system?

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Rafal Wijata - 2008-09-02

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Intel quad-core xeon.

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Jes Sorensen - 2010-08-19

Hi

Trying to catch up on the old bugs.

Do you still experience this problem with a current version of KVM? The problem should
be resolved in upstream, in particular if you run with kvmclock.

Would you please close this bug if the problem is no longer there?

Thanks,
Jes

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Rafal Wijata - 2010-08-19

I've give up on this a long time ago and switched to ESXi - sorry.

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gettimeofday goes backward

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#291 gettimeofday goes backward

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