Date: Wed, 21 Oct 2009 11:58:34 -0300 From: Paul Halliday <paul.halliday@gmail.com> To: questions@freebsd.org Subject: Looking for troubleshooting tips. Message-ID: <2dab70a30910210758q616eb1e6sb42d5405f0ec9d1f@mail.gmail.com>
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I use Freebsd as the base for my network monitoring sensors. These machines run a netflow probe, act as a netflow collector and spool full content data from a snort process FIFO that is bound to a span port. During peak hours this can be 100MB saturated, its connected to a GB intel NIC on the box (there is a separate uplink). In the background numerous little scripts run to produce summary data. The basic template for these systems has been the same for the past 4 years and things have worked great. Recently, one of these machines started to become a little laggy and I can't seem to identify the issue. This system has always seen a lot of packet loss, I expect this though as it is a busy site but this has never affected its performance. Can an overloaded NIC cause serious performance issues like those I am seeing? This is a recent top: last pid: 98870; load averages: 1.54, 1.41, 1.31 up 1+01:57:10 11:50:24 142 processes: 2 running, 139 sleeping, 1 zombie CPU states: 30.9% user, 0.0% nice, 15.0% system, 1.7% interrupt, 52.4% idle Mem: 450M Active, 328M Inact, 168M Wired, 33M Cache, 110M Buf, 3700K Free Swap: 2048M Total, 5112K Used, 2043M Free 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Sun Feb 24 19:59:52 UTC 2008 To be honest, I don't know which counters are important. Is there anything specific I should be concentrating on to determine the cause? Thanks.
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