Bandwidth utilization is more than max speed












1















Ethtool shows max speed is 1Gb/s. But in glances/SAR results in more than 1.7Gb/s.
Can somebody clarify this...



# ethtool ethX | grep -i speed
Speed : 1000Mb/s


there is no dropped packets till now:



# cat /sys/class/net/ethX/statistics/tx_dropped
0

RX packets:159025710994 errors:0 dropped:0 overruns:36682 frame:0
TX packets:121415304749 errors:0 dropped:0 overruns:0 carrier:0


enter image description here



Note: Bonding is not configured










share|improve this question

























  • Is the UDP traffic you are feeding meaningful or just trying to overload it?

    – Rui F Ribeiro
    Feb 28 at 20:10











  • can you show txdrops/s?

    – Rui F Ribeiro
    Feb 28 at 20:44













  • can we see tx_dropped while Tx/s is showing 1.7Gbps?

    – Rui F Ribeiro
    Feb 28 at 21:36











  • @RuiFRibeiro plz check my edit

    – msp9011
    Feb 28 at 22:42
















1















Ethtool shows max speed is 1Gb/s. But in glances/SAR results in more than 1.7Gb/s.
Can somebody clarify this...



# ethtool ethX | grep -i speed
Speed : 1000Mb/s


there is no dropped packets till now:



# cat /sys/class/net/ethX/statistics/tx_dropped
0

RX packets:159025710994 errors:0 dropped:0 overruns:36682 frame:0
TX packets:121415304749 errors:0 dropped:0 overruns:0 carrier:0


enter image description here



Note: Bonding is not configured










share|improve this question

























  • Is the UDP traffic you are feeding meaningful or just trying to overload it?

    – Rui F Ribeiro
    Feb 28 at 20:10











  • can you show txdrops/s?

    – Rui F Ribeiro
    Feb 28 at 20:44













  • can we see tx_dropped while Tx/s is showing 1.7Gbps?

    – Rui F Ribeiro
    Feb 28 at 21:36











  • @RuiFRibeiro plz check my edit

    – msp9011
    Feb 28 at 22:42














1












1








1








Ethtool shows max speed is 1Gb/s. But in glances/SAR results in more than 1.7Gb/s.
Can somebody clarify this...



# ethtool ethX | grep -i speed
Speed : 1000Mb/s


there is no dropped packets till now:



# cat /sys/class/net/ethX/statistics/tx_dropped
0

RX packets:159025710994 errors:0 dropped:0 overruns:36682 frame:0
TX packets:121415304749 errors:0 dropped:0 overruns:0 carrier:0


enter image description here



Note: Bonding is not configured










share|improve this question
















Ethtool shows max speed is 1Gb/s. But in glances/SAR results in more than 1.7Gb/s.
Can somebody clarify this...



# ethtool ethX | grep -i speed
Speed : 1000Mb/s


there is no dropped packets till now:



# cat /sys/class/net/ethX/statistics/tx_dropped
0

RX packets:159025710994 errors:0 dropped:0 overruns:36682 frame:0
TX packets:121415304749 errors:0 dropped:0 overruns:0 carrier:0


enter image description here



Note: Bonding is not configured







centos bandwidth






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Mar 5 at 9:44







msp9011

















asked Feb 28 at 19:45









msp9011msp9011

4,44344167




4,44344167













  • Is the UDP traffic you are feeding meaningful or just trying to overload it?

    – Rui F Ribeiro
    Feb 28 at 20:10











  • can you show txdrops/s?

    – Rui F Ribeiro
    Feb 28 at 20:44













  • can we see tx_dropped while Tx/s is showing 1.7Gbps?

    – Rui F Ribeiro
    Feb 28 at 21:36











  • @RuiFRibeiro plz check my edit

    – msp9011
    Feb 28 at 22:42



















  • Is the UDP traffic you are feeding meaningful or just trying to overload it?

    – Rui F Ribeiro
    Feb 28 at 20:10











  • can you show txdrops/s?

    – Rui F Ribeiro
    Feb 28 at 20:44













  • can we see tx_dropped while Tx/s is showing 1.7Gbps?

    – Rui F Ribeiro
    Feb 28 at 21:36











  • @RuiFRibeiro plz check my edit

    – msp9011
    Feb 28 at 22:42

















Is the UDP traffic you are feeding meaningful or just trying to overload it?

– Rui F Ribeiro
Feb 28 at 20:10





Is the UDP traffic you are feeding meaningful or just trying to overload it?

– Rui F Ribeiro
Feb 28 at 20:10













can you show txdrops/s?

– Rui F Ribeiro
Feb 28 at 20:44







can you show txdrops/s?

– Rui F Ribeiro
Feb 28 at 20:44















can we see tx_dropped while Tx/s is showing 1.7Gbps?

– Rui F Ribeiro
Feb 28 at 21:36





can we see tx_dropped while Tx/s is showing 1.7Gbps?

– Rui F Ribeiro
Feb 28 at 21:36













@RuiFRibeiro plz check my edit

– msp9011
Feb 28 at 22:42





@RuiFRibeiro plz check my edit

– msp9011
Feb 28 at 22:42










1 Answer
1






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oldest

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Quite simply having a larger value than the capacity of an interface on the output side, does not mean the interface is sending all that traffic; it means however you are trying to send all that traffic and overloading at least the interface.



Most of the extra traffic will be dropped. Have a look at the overrun value.




If the capacity of the interface is exceeded, the frame that is
currently being received is dropped and the overrun counter is
incremented.




PS Having a SCP doing this does not match much the behaviour of a TCP based application, and much less SCP, which is known for being slow. It seems much more typical of a UDP based/multicasting/torrent based application. I strongly suspect something is being overlooked.






share|improve this answer


























  • Has the destination a 10Gbps interface or is a jumbo-enabled interface/network?

    – Rui F Ribeiro
    Mar 2 at 18:01













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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2














Quite simply having a larger value than the capacity of an interface on the output side, does not mean the interface is sending all that traffic; it means however you are trying to send all that traffic and overloading at least the interface.



Most of the extra traffic will be dropped. Have a look at the overrun value.




If the capacity of the interface is exceeded, the frame that is
currently being received is dropped and the overrun counter is
incremented.




PS Having a SCP doing this does not match much the behaviour of a TCP based application, and much less SCP, which is known for being slow. It seems much more typical of a UDP based/multicasting/torrent based application. I strongly suspect something is being overlooked.






share|improve this answer


























  • Has the destination a 10Gbps interface or is a jumbo-enabled interface/network?

    – Rui F Ribeiro
    Mar 2 at 18:01


















2














Quite simply having a larger value than the capacity of an interface on the output side, does not mean the interface is sending all that traffic; it means however you are trying to send all that traffic and overloading at least the interface.



Most of the extra traffic will be dropped. Have a look at the overrun value.




If the capacity of the interface is exceeded, the frame that is
currently being received is dropped and the overrun counter is
incremented.




PS Having a SCP doing this does not match much the behaviour of a TCP based application, and much less SCP, which is known for being slow. It seems much more typical of a UDP based/multicasting/torrent based application. I strongly suspect something is being overlooked.






share|improve this answer


























  • Has the destination a 10Gbps interface or is a jumbo-enabled interface/network?

    – Rui F Ribeiro
    Mar 2 at 18:01
















2












2








2







Quite simply having a larger value than the capacity of an interface on the output side, does not mean the interface is sending all that traffic; it means however you are trying to send all that traffic and overloading at least the interface.



Most of the extra traffic will be dropped. Have a look at the overrun value.




If the capacity of the interface is exceeded, the frame that is
currently being received is dropped and the overrun counter is
incremented.




PS Having a SCP doing this does not match much the behaviour of a TCP based application, and much less SCP, which is known for being slow. It seems much more typical of a UDP based/multicasting/torrent based application. I strongly suspect something is being overlooked.






share|improve this answer















Quite simply having a larger value than the capacity of an interface on the output side, does not mean the interface is sending all that traffic; it means however you are trying to send all that traffic and overloading at least the interface.



Most of the extra traffic will be dropped. Have a look at the overrun value.




If the capacity of the interface is exceeded, the frame that is
currently being received is dropped and the overrun counter is
incremented.




PS Having a SCP doing this does not match much the behaviour of a TCP based application, and much less SCP, which is known for being slow. It seems much more typical of a UDP based/multicasting/torrent based application. I strongly suspect something is being overlooked.







share|improve this answer














share|improve this answer



share|improve this answer








edited Mar 2 at 17:52

























answered Mar 1 at 17:42









Rui F RibeiroRui F Ribeiro

41.6k1483141




41.6k1483141













  • Has the destination a 10Gbps interface or is a jumbo-enabled interface/network?

    – Rui F Ribeiro
    Mar 2 at 18:01





















  • Has the destination a 10Gbps interface or is a jumbo-enabled interface/network?

    – Rui F Ribeiro
    Mar 2 at 18:01



















Has the destination a 10Gbps interface or is a jumbo-enabled interface/network?

– Rui F Ribeiro
Mar 2 at 18:01







Has the destination a 10Gbps interface or is a jumbo-enabled interface/network?

– Rui F Ribeiro
Mar 2 at 18:01




















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