ifconfig on sl0 shows "overruns"

ifconfig on sl0 shows "overruns"

Post by Sylvain Duroch » Sun, 19 Jun 1994 05:40:37



Hello...

When I look at the ifconfig stats on sl0, I get the following:

          UP POINTOPOINT RUNNING  MTU 1500  Metric 1
          RX packets 102635 errors 17 dropped 10 overrun 87967
          TX packets 105919 errors  0 dropped 9 overrun 89220

Are these errors/dropped/overrun counts normal? If not, what can
I do to get rid of them?

I find that the performance on my slip link isn't too good.

Running: 1.1.19, uart: 16550, modem: Supra14.4k port locked at 38.4k.

Sylvain Durocher

 
 
 

ifconfig on sl0 shows "overruns"

Post by Brian Stol » Sun, 19 Jun 1994 09:50:46


: Hello...
:  
: When I look at the ifconfig stats on sl0, I get the following:

:           UP POINTOPOINT RUNNING  MTU 1500  Metric 1
:           RX packets 102635 errors 17 dropped 10 overrun 87967
:           TX packets 105919 errors  0 dropped 9 overrun 89220

You are probably running CSLIP [Compressed SLIP].. In CSLIP, overruns
really mean "compressed packets".. more, the better.

--

- Brian Stoler


 
 
 

ifconfig on sl0 shows "overruns"

Post by Jukka Jarnbe » Sun, 19 Jun 1994 16:40:50



Quote:>Hello...

>When I look at the ifconfig stats on sl0, I get the following:
>          UP POINTOPOINT RUNNING  MTU 1500  Metric 1
>          RX packets 102635 errors 17 dropped 10 overrun 87967
>          TX packets 105919 errors  0 dropped 9 overrun 89220
>Are these errors/dropped/overrun counts normal? If not, what can
>I do to get rid of them?

I saw some comment on this matter mentioning that those overruns probaly
come from using mode CSLIP and they are not actual overruns but some quirk
causing those reports from dip-program  :)

Quote:

>I find that the performance on my slip link isn't too good.

>Running: 1.1.19, uart: 16550, modem: Supra14.4k port locked at 38.4k.

>Sylvain Durocher

Jukka Jarnberg
 
 
 

ifconfig on sl0 shows "overruns"

Post by Chris Smi » Mon, 20 Jun 1994 08:27:57




>Hello...

>When I look at the ifconfig stats on sl0, I get the following:

>          UP POINTOPOINT RUNNING  MTU 1500  Metric 1
>          RX packets 102635 errors 17 dropped 10 overrun 87967
>          TX packets 105919 errors  0 dropped 9 overrun 89220

>Are these errors/dropped/overrun counts normal? If not, what can
>I do to get rid of them?

I had the same problems until I changed the MTU to 1004 (my
slip server supports 1024). After I did that my overruns went away.

I also started using SLIP as opposed to CSLIP, since my server did
not really support CSLIP very well.

Hope this helps,

--
------------------------------------------------------------------------
|Christopher Smith           | With a * duck, one's never alone.  |

------------------------------------------------------------------------

 
 
 

ifconfig on sl0 shows "overruns"

Post by Bernard James Lea » Tue, 21 Jun 1994 18:45:07




: >Hello...
: >
: >When I look at the ifconfig stats on sl0, I get the following:
: >
: >
: >          UP POINTOPOINT RUNNING  MTU 1500  Metric 1
: >          RX packets 102635 errors 17 dropped 10 overrun 87967
: >          TX packets 105919 errors  0 dropped 9 overrun 89220
: >
: >Are these errors/dropped/overrun counts normal? If not, what can
: >I do to get rid of them?
: >

: I had the same problems until I changed the MTU to 1004 (my
: slip server supports 1024). After I did that my overruns went away.

: I also started using SLIP as opposed to CSLIP, since my server did
: not really support CSLIP very well.

From my understanding CSLIP reports the number of compressed packet
headers via the overrun status field.

Thus if you are using CSLIP there is no way to find out the number
of overruns.  (perhaps from a kernel log?).

Anyhow with that many overruns its very likely that you would notice
a signifigant throughput loss.

--
Bernard Leach - LaTrobe Uni Melb Australia

 
 
 

ifconfig on sl0 shows "overruns"

Post by Norbert J. Girar » Wed, 22 Jun 1994 02:11:17




: >Hello...
: >
: >When I look at the ifconfig stats on sl0, I get the following:
: >
: >
: >          UP POINTOPOINT RUNNING  MTU 1500  Metric 1
: >          RX packets 102635 errors 17 dropped 10 overrun 87967
: >          TX packets 105919 errors  0 dropped 9 overrun 89220
: >
: >Are these errors/dropped/overrun counts normal? If not, what can
: >I do to get rid of them?
: >

These counts are *NORMAL*!!!! because with cslip the overrun field is
used as counter for cslip packets:-)

: I had the same problems until I changed the MTU to 1004 (my
: slip server supports 1024). After I did that my overruns went away.
Not really :-)

: I also started using SLIP as opposed to CSLIP, since my server did
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
: not really support CSLIP very well.

That's the reason why "overruns" went away. No cslip= no cslip packets
to count in the overloaded "overrun" field.

BTW, newer ifconfigs do show this field as "compressed".

- Norbert

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