Olivier Dony wrote:
On Sunday, 16 March, 2003 16:23, Simon Barner wrote:
Are you running your network adaptor in full-duplex mode? Perhaps the device on
the other end of the wire does only support half-duplex. Changing this increased
the throughput from 20kb/s to almost 1mb/s on our internal network here
(10baseT/UTP).
I'm not really sure about this, here is the output of ifconfig related
to the external interface :
[EMAIL PROTECTED]:/root# ifconfig -m fxp0
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet xxx.xxx.191.100 netmask 0xfffffff0 broadcast xxx.xxx.191.111
inet xxx.xxx.191.101 netmask 0xffffffff broadcast xxx.xxx.191.101
ether 00:e0:81:23:c5:32
media: Ethernet autoselect (10baseT/UTP)
status: active
supported media:
media autoselect
media 100baseTX mediaopt full-duplex
media 100baseTX
media 10baseT/UTP mediaopt full-duplex
media 10baseT/UTP
media 100baseTX mediaopt hw-loopback
It seems that fxp(4) supports full-duplex but that it is currently
disabled, and I guess this is because the other end of the wire doesn't
support it, since the media has been autoselected? Please correct me
as I have never played a lot with ifconfig except for basic configutarion.
I wouldn't be too eager to do tests with this setting since this is a
production server and I have no direct physical access to it, so shutting
down the only interface by mistake is *not* an option ;-)
But if I was to change it, how would I go about this without shutting down
fxp0? 'ifconfig fxp0 media 10baseT/UTP mediaopt full-duplex' ??
I have seen cases where the media type was auto-negiotiated wrong. I think
this was due to crappy wiring, but the circumstances didn't allow for a lot
of experimenting.
I would suggest talking to your ISP and verifying what the connection _should_
be. Then work towards getting it there. When the two ends see something
different, performance blows.
Going to full-duplex should reduce collisions to 0, and give you the max
performance available. I just did some experimenting with turning duplex
from half to full and back on my computer here, and if there's any interruption,
it was less than I could easily measure. Don't know if that'll be the same
with all switches or not.
--
Bill Moran
Potential Technologies
http://www.potentialtech.com
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