The predominant suggestion was to check/force the duplex on the machine and
on the switch to either full or half duplex. I tried it both ways,
disabling the port, setting to half or full on both sides, then reenabling
the port.
all I have in /etc/rc.config for IFCONFIG_0="<machineip> netmask 255.255.255.0"
so I tried changing the duplex at boot level
I tried all combinations... at boot level, the machines had ewa0_mode
FastFD and the switch was set at auto-negotiate which selected half duplex.
Ok... so just change it right?
I tried explicitly telling the switch to use full duplex... same problem
I tried explicitly telling the machine and the switch to do half duplex...
same problem
And disabled ports before change, and enabled after change. Even tried a
powerdown.
I don't expect it's the cables (cat 5, 1meter) since they transfer 5-10x
faster to 10mbps machines.
I realize cpu/disk speed may result in a greater bottleneck than the
switch/network, but it should at least approach the performance of the same
file from a 10mbps machine. I've tried it with both nfs copies, and with
ftp (eliminating the cause of an nfs problem?).
netstat -i shows virtually no Ierrs Oerrs or Coll. "monitor" also didn't
show anything strange.
Still scratching my head...
Here's the original thread...
>Ok... we have a bunch of servers... 3 of which are 100mbps and 6 are 10mbps.
>Here's the times of nfs copy/ftp of a ~3.5mb file
>
>10mbps machine --> 10mbps machine 4.3 sec
>10mbps machine --> 100mbps machine 7.6 sec
>100mbps machine --> 10mbps machine 5.6 sec
>100mbps machine --> 100mbps machine 142.5 sec ----WHY?!
>
>I think i've ruled out nfs problems since all machines are using automount
>and all are mounted using 2mb read/write cache (I've tried disabling cache
>too).
>They are all on the same subnet and same Cisco 2916 10/100 switch, and
>settings on the switch are pretty much default set when it comes out of
the box
>the 100mbps machines are set at eprom to do 100mbps, and the switch
>autoconfigures as 100mbps, half duplex
>
>I don't think the gateway is the problem since they are all on the same
>subnet but how does a machine determine which of 2 gateways to use? All
>machines are running /usr/sbin/gated and most or all don't have a
>/etc/gated.conf or /etc/gateways file
>
>one 100mbps machine's ifconfig tu0:
>tu0: flags=c63<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST,SIMPLEX>
> inet 128.230.57.16 netmask ffffff00 broadcast 128.230.57.255 ipmtu 1500
>
>one 10mbps machine's ifconfig ln0:
>ln0: flags=c63<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST,SIMPLEX>
> inet 128.230.57.3 netmask ffffff00 broadcast 128.230.57.255 ipmtu 1500
>
>Any other ideas of why the 10x difference or something I may be missing?
>
--------------------------------------------------------------------------
Dan Kirkpatrick dkirk_at_phy.syr.edu
Computer Systems Manager
Department of Physics
Syracuse University, Syracuse, NY
http://www.phy.syr.edu/~dkirk Fax: (315) 443-9103
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Received on Fri Apr 23 1999 - 20:06:37 NZST