Network Help

Victor Farah victor at
Wed Feb 13 16:01:51 UTC 2008

I'm updating the system to 6.3-release now.

All 13 machines are on the same subnet but they are scattered across 
different switchs.

netstat -m:
7716/399/8115 mbufs in use (current/cache/total)
7388/326/7714/25600 mbuf clusters in use (current/cache/total/max)
7380/41 mbuf+clusters out of packet secondary zone in use (current/cache)
0/0/0/0 4k (page size) jumbo clusters in use (current/cache/total/max)
0/0/0/0 9k jumbo clusters in use (current/cache/total/max)
0/0/0/0 16k jumbo clusters in use (current/cache/total/max)
16705K/751K/17456K bytes allocated to network (current/cache/total)
0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
0/0/0 requests for jumbo clusters denied (4k/9k/16k)
0/6/6656 sfbufs in use (current/peak/max)
0 requests for sfbufs denied
0 requests for sfbufs delayed
0 requests for I/O initiated by sendfile
193374 calls to protocol drain routines

ifconfig -a:
         inet 192.168.X.X netmask 0xffffff00 broadcast 192.168.X.255
         ether 00:1b:fc:ef:34:de
         media: Ethernet autoselect (1000baseTX <full-duplex>)
         status: active
         inet X.X.X.X netmask 0xffffff00 broadcast X.X.X.255
         ether 00:1b:fc:ef:34:df
         media: Ethernet 1000baseTX <full-duplex>
         status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
         inet6 fe80::1%lo0 prefixlen 64 scopeid 0x4
         inet6 ::1 prefixlen 128
         inet netmask 0xff000000

Derek Ragona wrote:
> At 01:50 PM 2/12/2008, Victor Farah wrote:
>> Hello,
>> I have a machine setup with FreeBSD 6.3-PRERELEASE setup on a 
>> 10/100/1000 switch.  There are a pair of em interfaces, and the 
>> network traffic on this machine is very spuratic.  Both EM interfaces 
>> reach 100Mbps and falls to 5~10Mbps, the very next minute, the traffic 
>> is very spuratic.  The media of the interfaces is as follows:
>> EM0: media: Ethernet autoselect (1000baseTX <full-duplex>)
>> EM1: media: Ethernet 1000baseTX <full-duplex>
>> Currently the EM1 card is in use.
>> I watch an MRTG that I have setup to see the machine failing at 
>> sustaining its bandwidth.
>> I have 13 other machines setup the same way but traffic is running 
>> fine and working very well, the only difference between those and the 
>> new one, is that it's pushing much more data through it; almost the 
>> same amount of data the 13 other machines push combined.
> First you should update this system to 6.3 release.
> Also you should post how your interfaces are configured, you can copy 
> and paste the output from:
> ifconfig -a
> You also need to better explain the topology of your network.  For 
> instance are all 13 systems on the same subnet?  or are you running 
> multiple subnets with a switched backbone?  How many switches are you 
> using?  Are you checking the throughput across a LAN segment or across 
> multiple subnet segments?
>         -Derek

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