Overruns ?

Overruns ?

[Michael Gale]

Hello,

	Not sure if this is the place to ask but when I do a ifconfig I see some
overruns. I have tried google and man ifconfig but can not find what a "overrun"
is.

eth0      Link encap:Ethernet  HWaddr 00:E0:81:25:A6:92  
          inet addr:10.10.10.173  Bcast:10.10.10.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9639161 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9598780 errors:0 dropped:0 overruns:21 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:2726609687 (2600.2 Mb)  TX bytes:1986194437 (1894.1 Mb)
          Interrupt:10 Base address:0xb000 



-- 
Michael Gale
Network Administrator
Utilitran Corporation

Re: Overruns ?

[John A. Sullivan III]

On Thu, 2004-02-19 at 10:32, Michael Gale wrote:
> Hello,
> 
> 	Not sure if this is the place to ask but when I do a ifconfig I see some
> overruns. I have tried google and man ifconfig but can not find what a "overrun"
> is.
> 
> eth0      Link encap:Ethernet  HWaddr 00:E0:81:25:A6:92  
>           inet addr:10.10.10.173  Bcast:10.10.10.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:9639161 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:9598780 errors:0 dropped:0 overruns:21 carrier:0
>           collisions:0 txqueuelen:100 
>           RX bytes:2726609687 (2600.2 Mb)  TX bytes:1986194437 (1894.1 Mb)
>           Interrupt:10 Base address:0xb000 
Perhaps someone else can answer more authoritatively than I but I have
always assumed that it means the physical interface picked up a packet
addressed to it but had no buffer into which it could put the packet. 
In other words, the system ran out of memory dedicated to packet
buffering.

One can either increase the number of buffers allocated to buffering
packets or identify the source of the bottleneck.  On a standalone
system, it might be the processor. In the case of a packet passing
device, increase the bandwidth on the egress.

I do not know where one configures the number of cache buffers in Linux
but that would be a handy trick to know.  I'm sure someone does know it
off the top of their head.  Next person . . . 
-- 
Open Source Development Corporation
Financially Sustainable open source development
http://www.opensourcedevelopmentcorp.com

Re: Overruns ?

[Michael Gale]

Hello,

	This network device is on a small (5 hub) network with all the other cards
being on-board GB cards. This network device is a cheap Dlink 10/100 card. 

I am going to try changing the card to a GB card as well ... since there also
seems to be a fair amount of collision.

Michael.



On Thu, 19 Feb 2004 13:43:34 -0500
"John A. Sullivan III" <jsullivan@opensourcedevelopmentcorp.com> wrote:

> On Thu, 2004-02-19 at 10:32, Michael Gale wrote:
> > Hello,
> > 
> > 	Not sure if this is the place to ask but when I do a ifconfig I see some
> > overruns. I have tried google and man ifconfig but can not find what a
> > "overrun" is.
> > 
> > eth0      Link encap:Ethernet  HWaddr 00:E0:81:25:A6:92  
> >           inet addr:10.10.10.173  Bcast:10.10.10.255  Mask:255.255.255.0
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >           RX packets:9639161 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:9598780 errors:0 dropped:0 overruns:21 carrier:0
> >           collisions:0 txqueuelen:100 
> >           RX bytes:2726609687 (2600.2 Mb)  TX bytes:1986194437 (1894.1 Mb)
> >           Interrupt:10 Base address:0xb000 
> Perhaps someone else can answer more authoritatively than I but I have
> always assumed that it means the physical interface picked up a packet
> addressed to it but had no buffer into which it could put the packet. 
> In other words, the system ran out of memory dedicated to packet
> buffering.
> 
> One can either increase the number of buffers allocated to buffering
> packets or identify the source of the bottleneck.  On a standalone
> system, it might be the processor. In the case of a packet passing
> device, increase the bandwidth on the egress.
> 
> I do not know where one configures the number of cache buffers in Linux
> but that would be a handy trick to know.  I'm sure someone does know it
> off the top of their head.  Next person . . . 
> -- 
> Open Source Development Corporation
> Financially Sustainable open source development
> http://www.opensourcedevelopmentcorp.com
> 
> 
> 
> 
> 


-- 
Michael Gale
Network Administrator
Utilitran Corporation