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Eth0 Limitations

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Operating Systems Linux Red Hat Eth0 Limitations
# 8  
Old 05-16-2012
I appreciate your effort but you are incorrect, the driver and NIC compatibility is not the issue.

Code:
# lspci | grep -ieth
02:00.0 Ethernet controller: Emulex Corporation OneConnect 10Gb NIC (be3) (rev 01)
02:00.1 Ethernet controller: Emulex Corporation OneConnect 10Gb NIC (be3) (rev 01)
0c:04.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5715S Gigabit Ethernet (rev a3)
0c:04.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5715S Gigabit Ethernet (rev a3)
0e:04.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5715S Gigabit Ethernet (rev a3)
0e:04.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5715S Gigabit Ethernet (rev a3)
[root@lnprodapp02 ~]# ethtool -i eth0
driver: be2net
version: 4.0.100r
firmware-version: 3.102.517.701
bus-info: 0000:02:00.0

I use mostly iptraf & sar to check the network.

The cisco switch is 1Gb.

R,
D.
# 9  
Old 05-16-2012
I did not say the driver was incompatible, but rather you gave me erroneous information.

Sar is not going to give you throughput metrics, and neither will iptraf. You would need something like iperf or ttcp.

using a txqueuelen of 1000, and an MTU of 1500 will further limit you, but since you don't seem to know, or want to know what your actual throughput is, your latency, then I leave it up to you to keep tuning the app blindly.

You keep saying there are issues, but no information about where the numbers for the issues are. To put it into a bad car analogy:

Why do you care what the RPMs of the motor are if you have no idea how fast you are going?
# 10  
Old 05-17-2012
sar provides historical info on the total number of bytes recieved and transmitted per second, and iptraf gathers byte counts, and interface stats. This is needed to tace and compare the byte count at the time when the app crashed. Not sure if iperf provides historical data?

However, looks like a useful tool all the same. I gathered some output from the following command.

Can you explain then how I can obtain my max throughput info from this? - Don't want to drive my car too fast and break any speed limits in a restricted zone.

Code:
# iperf -c <host_ip> -d -p 8080
------------------------------------------------------------
Server listening on TCP port 8080
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to <host_IP>, TCP port 8080
TCP window size: 49.3 KByte (default)
------------------------------------------------------------
[ 5] local <host_ip> port 40000 connected with <host_ip> port 8080
[ 4] local <host_ip> port 8080 connected with <host_ip> port 40000
[ ID] Interval Transfer Bandwidth
[ 5] 0.0-10.0 sec 18.3 GBytes 15.7 Gbits/sec
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 18.3 GBytes 15.7 Gbits/sec




# 11  
Old 05-17-2012
Did you connect the client from the same machine?

That will not work if you do, because according to this, you are breaking physics.
# 12  
Old 05-18-2012
No in that case I am not in breach of breaking physics.
# 13  
Old 05-18-2012
The reason I ask is that you are taking a 1Gbit device to 15.7Gbit.
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