How to find out capacity for network interfaces?
27,860
Solution 1
You're looking in the wrong place.
Look at /sys/class/net/<device>/speed
.
Solution 2
You can check the interface capacity in following ways.
dmesg | grep eth0
mii-tool -v eth0
ethtool eth0
Note: Change the device name according to yours.
Solution 3
In general, you could find this out using a tool such as strace:
sudo strace -e trace=file -f -s128 lshw -class network
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schemacs
Updated on September 18, 2022Comments
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schemacs almost 2 years
I could get the capacity for the network interface by lshw, but which file in sysfs is this information stored(i.e. which file in /sys/class/net/eth0/device/ directory)?
$ sudo lshw -class network *-network description: Ethernet interface product: 82579LM Gigabit Network Connection vendor: Intel Corporation physical id: 19 bus info: pci@0000:00:19.0 logical name: eth0 version: 04 serial: 3c:97:0e:b4:5c:6a capacity: 1Gbit/s width: 32 bits clock: 33MHz capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=2.3.2-k firmware=0.13-3 latency=0 link=no multicast=yes port=twisted pair resources: irq:43 memory:f2500000-f251ffff memory:f253b000-f253bfff ioport:6080(size=32) $ ls /sys/class/net/eth0/device/ broken_parity_status d3cold_allowed enable local_cpus net remove resource0 subsystem_device class device firmware_node modalias numa_node rescan resource1 subsystem_vendor config dma_mask_bits irq msi_bus power reset resource2 uevent consistent_dma_mask_bits driver local_cpulist msi_irqs ptp resource subsystem vendor
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schemacs about 10 years
cat: /sys/class/net/wlan0/speed: Invalid argument
, how to get the content? -
schemacs about 10 yearsYou are so nice to tell me how to trace files opened by programs. Thanks.
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schemacs about 10 yearsYes, I have also found out that. So what's the unit for this file:
sudo cat /sys/class/net/eth0/speed
gives 100 while lshw showscapacity: 1Gbit/s size: 100Mbit/s
.(I wonder where size comes from. sorry this might be another question). -
Michael Hampton about 10 years100 means it's actually running at 100Mbit/sec.
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schemacs about 10 yearsHow could I know the max capacity(not which speed it is now) for this interface?
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schemacs about 10 yearsThis may be useful: stackoverflow.com/questions/2872058/…