Re: Network throughput: Never get more than 112MB/s

On Mon, 11.04.2011 at 12:00:39 +0200, Denny Schierz wrote:
> hi,
> 
> after testing severals loadbalancing (LACP) types with Cisco, we saw,
> that we never get more than 112MB/s with two network cards and iperf. 
> 
> So, we tested without loadbalancing, 4 Clients (iperf -f M -c <ip>) and
> two target IPs. Every IP has his own 1Gb/s network card.
> On the end, two clients had a connection to IP 1 and the second two to
> IP 2.
> 
> First we used the two onboard NICs and then, one onboard and one
> external NIC, but without success. We never get more then 112MB/s
> 
> All are connected through a Cisco Catalyst WS-X4515.
> 
> The mainboard is a Intel S3420GP.

Are the NICs PCI or PCIe? If the former, IIRC the PCI bus bandwidth
maxes out at 133MB/s so that might explain your numbers. If your NICs are
PCIe, I have no helpful clues, sorry.

Uli
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