Why does 1GBit card have output limited to 80 MiB ?

Posted by Gallus on Server Fault See other posts from Server Fault or by Gallus
Published on 2009-06-17T14:08:32Z Indexed on 2010/03/16 8:46 UTC
Read the original article Hit count: 308

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networking

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ethernet

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gigabit-ethernet

I'm trying to utilize maximal bandwidth provided by my 1GiB network card, but it's always limited to 80MiB (real megabytes). What can be the reason? Card description (lshw output):

   description: Ethernet interface
    product: DGE-530T Gigabit Ethernet Adapter (rev 11)
    vendor: D-Link System Inc
    physical id: 0
    bus info: pci@0000:03:00.0
    logical name: eth1
    version: 11
    serial: 00:22:b0:68:70:41
    size: 1GB/s
    capacity: 1GB/s
    width: 32 bits
    clock: 66MHz
    capabilities: pm vpd bus_master cap_list rom ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation

The card is placed in following PCI slot:

*-pci:2
     description: PCI bridge
     product: 82801 PCI Bridge
     vendor: Intel Corporation
     physical id: 1e
     bus info: pci@0000:00:1e.0
     version: 92
     width: 32 bits
     clock: 33MHz
     capabilities: pci subtractive_decode bus_master cap_list

The PCI isn't any PCI Express right? It's a legacy PCI slot? So maybe this is the reason?

OS is a linux.

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