Speed of the network card

Speed of the network card

[Sourav Ghosh]

Hello,

I was wondering how I can determine the speed of a network device inside
the kernel.

In case of ethernet, the "name" field  of device structure will only
give eth0 or something. But the speed could be either 10Mbps or 100Mbps.

Thanks,

--
Sourav


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Re: Speed of the network card

[Chris Wedgwood]

On Sat, Jan 06, 2001 at 08:20:02PM -0500, Sourav Ghosh wrote:

    I was wondering how I can determine the speed of a network device
    inside the kernel.

what kind of network card?
    
    In case of ethernet, the "name" field  of device structure will
    only give eth0 or something. But the speed could be either 10Mbps
    or 100Mbps.

we don't have a good was on doing this sort of thing, you could try
mii-tool though; it supports many cards



  --cw
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Re: Speed of the network card

[Sourav Ghosh]

> 
> On Sat, Jan 06, 2001 at 08:20:02PM -0500, Sourav Ghosh wrote:
> 
>     I was wondering how I can determine the speed of a network device
>     inside the kernel.
> 
> what kind of network card?
>     
>     In case of ethernet, the "name" field  of device structure will
>     only give eth0 or something. But the speed could be either 10Mbps
>     or 100Mbps.
> 

Well, I need to clarify the question.

I would like to determine the banwidth the card is getting from
the network. 
For an ethernet, it could be either 10Mbps or 100Mbps, is there any
way of knowing from inside the kernel how much is the bandwidth the
card is actually receiving from the network, especially when it is capable of
getting either 10Mbps or 100Mbps?
  


> we don't have a good was on doing this sort of thing, you could try
> mii-tool though; it supports many cards
> 
> 
> 
>   --cw

-- 
Sourav


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Re: Speed of the network card

[Chris Wedgwood]

On Sun, Jan 07, 2001 at 04:30:30AM -0500, Sourav Ghosh wrote:

    I would like to determine the banwidth the card is getting from
    the network.

/proc/net/dev exports counters; you can monitor those -- I'm sure
there are perfomance program that do exactly this.

    For an ethernet, it could be either 10Mbps or 100Mbps, is there
    any way of knowing from inside the kernel how much is the
    bandwidth the card is actually receiving from the network,
    especially when it is capable of getting either 10Mbps or
    100Mbps?

The kernel counts packets and bytes; you need to work out bandwidth
in userland from that.


  --cw
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Re: Speed of the network card

[Sasi Peter]

On Mon, 8 Jan 2001, Chris Wedgwood wrote:

>     I would like to determine the banwidth the card is getting from
>     the network.
> /proc/net/dev exports counters; you can monitor those -- I'm sure
> there are perfomance program that do exactly this.

I have this little script for monitoring interfaces' speed on 132
wide textmode console w/ niche histogram. It is not perfect but 'it
works for me' (tm).

--------------------------> cut here
if [ "$1" = "" ]
then
  echo "Please specify the sampling rate."
  exit
fi

while true
do
  cat /proc/net/ip_fwnames &
  sleep $1
done |
  awk '
    BEGIN {
     s=0
     d='$1'*1024*1024
     wd=d/15
    }

    /^input /	{o=s
		 s=$7}
    /^output /	{s+=$7
                 w=(s-o)/wd
		 if(w>130)w=0
                 printf "%fMB/s %0*c\n",(s-o)/d,w,">"}
  '
--------------------------> cut here

-- 
SaPE - Peter, Sasi - mailto:sape@sch.hu - http://sape.iq.rulez.org/


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Re: Speed of the network card

[Jeff Chua]

from pcmcia-cs-3.1.22/PCMCIA-HOWTO
4.3.2.  Comments about specific cards
  o  16-bit PCMCIA cards have a maximum performance of 1.5-2 MB/sec.
     That means that any 16-bit 100baseT card (i.e., any card that uses
     the pcnet_cs, 3c574_cs, smc91c92_cs, or xirc2ps_cs driver) will
     never achieve full 100baseT throughput.  Only CardBus network
     adapters can fully exploit 100baseT data rates.


Jeff


On Sun, Jan 07, 2001 at 04:30:30AM -0500, Sourav Ghosh wrote:

    I would like to determine the banwidth the card is getting from
    the network.

/proc/net/dev exports counters; you can monitor those -- I'm sure
there are perfomance program that do exactly this.

    For an ethernet, it could be either 10Mbps or 100Mbps, is there
    any way of knowing from inside the kernel how much is the
    bandwidth the card is actually receiving from the network,
    especially when it is capable of getting either 10Mbps or
    100Mbps?

The kernel counts packets and bytes; you need to work out bandwidth
in userland from that.


  --cw
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