Topic
1 reply Latest Post - ‏2012-07-12T18:29:13Z by j.gann
abyalex
abyalex
5 Posts
ACCEPTED ANSWER

Pinned topic Link Seep for 10G Port

‏2012-07-12T03:53:25Z |
Hi,

I am currently using the 10 Gb Ethernet-SR PCI Express Dual Port Adapter (771000801410b003) in VIOS and i am only getting the link speed as 2.5 Gbps. I am not understanding why it is showing only 2.5 Gbps instead of 10 Gbps.

Here is the output of entstat,

$ oem_setup_env
  1. entstat -d ent6 | grep -i speed
Media Speed Running: 10 Gbps Full Duplex
Current Link Speed: 2.5 Gbps
  1. entstat -d ent5 | grep -i speed
Media Speed Running: 10 Gbps Full Duplex
Current Link Speed: 2.5 Gbps

Can anyone guide me why it is showing? is there limitations from the network side or do i need to do any tuning.

Regards,
aby
Updated on 2012-07-12T18:29:13Z at 2012-07-12T18:29:13Z by j.gann
  • j.gann
    j.gann
    52 Posts
    ACCEPTED ANSWER

    Re: Link Seep for 10G Port

    ‏2012-07-12T18:29:13Z  in response to abyalex
    here is a paper on 10g throughput which matches my observations on aix/power. in general, ethernet flow control is a good idea (enable on switchport and adapter, will prevent tcp retransmissions) and (in case hosts and switchports in your network allow it) use jumbo frames for high bandwidth applications.

    http://www.lanl.gov/radiant/pubs/10GigE/hoti03.pdf

    joachim gann