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My boot time with VirtualBox installed takes far too long. The following is an excerpt from dmseg at the point where it loads:

[   59.540060] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
[  125.609989] vboxdrv: Found 2 processor cores.
[  125.610105] vboxdrv: fAsync=0 offMin=0x4de offMax=0x1008
[  125.610162] vboxdrv: TSC mode is 'synchronous', kernel timer mode is 'normal'.
[  125.610163] vboxdrv: Successfully loaded version 4.1.18_Ubuntu (interface 0x00190000).
[  125.857220] vboxpci: IOMMU not found (not registered)

Is there any way to get rid of this lag?

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Are you sure is Virtualbox that is increasing the boot time? From the log you provided it seems that is nf_conntrack which is taking too much time... –  Salem Nov 8 '12 at 20:41
    
Yeah vbox is taking a whopping 250 milliseconds according to your log. You'd better try to find out why Netfilter (nf_conntrack) takes so long to load. Did you create firewall rules? (check with sudo iptables -vnL and sudo ip6tables -vnL. Also does grep net /etc/sysctl.conf output anything? –  jippie Nov 8 '12 at 21:32
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