# [OmniOS-discuss] kvm instances random short freeze

Tobias Oetiker tobi at oetiker.ch
Thu Mar 9 15:35:25 UTC 2017

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    Hi

    We are running kvm instances on omni r20 and are experiencing random short freezes.
    I wrote the following short test script to see how frequent the freezing occurres

    perl -e 'use Time::HiRes qw(time usleep); my $now = time; while(1){usleep 200000; my $next = time; my $diff = $next - $now; $now=$next; if ($diff > 0.22){ print "".localtime(time)." ".$diff,"\n"}}'

    the output looks like this

    Thu Mar 9 15:26:12 2017 0.224979877471924
    Thu Mar 9 15:26:23 2017 0.273133993148804
    Thu Mar 9 15:27:54 2017 1.17526292800903
    Thu Mar 9 15:28:59 2017 2.04209899902344
    Thu Mar 9 15:30:31 2017 1.0813729763031
    Thu Mar 9 15:30:44 2017 0.600342988967896
    Thu Mar 9 15:31:47 2017 1.43648099899292
    Thu Mar 9 15:32:25 2017 0.897988796234131
    Thu Mar 9 15:33:28 2017 0.998631000518799
    Thu Mar 9 15:34:10 2017 4.89306116104126
    Thu Mar 9 15:36:15 2017 1.22311997413635
    Thu Mar 9 15:38:57 2017 1.64742302894592
    Thu Mar 9 15:39:21 2017 1.36228013038635
    Thu Mar 9 15:40:08 2017 1.62232208251953
    Thu Mar 9 15:40:32 2017 1.37291598320007
    Thu Mar 9 15:42:30 2017 0.211127996444702

    as you can see there are quite frequent short freezes ...

    I am running the same script in the omnios global zone there is no freezing over 0.02s

    any ideas ?

    cheers
    tobi
    --
    Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
    www.oetiker.ch tobi at oetiker.ch +41 62 775 9902
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