New SM A1Sri-2758f build -> inconsistent speeds on gigabit downlink



  • Hi all,

    First - I will preface by saying that I spent considerable time researching my issue on the forums and unfortunately, can't come across a resolution. Cliff notes as following:

    • Recently acquired Comcast Xfinity gigabit service; have my own DOCSIS 3.1 Arris modem.

    • Upgraded from a D525 based Atom system to an shiny A1SRi-2758f with 4GB of ECC RAM and 30 gig SSD.

    • Restored from a pre-existing backup; modified interfaces before loading the backup and aside from a minor OpenVPN issue - no problems.

    • I have pfBlockerNG and Snort running; I do understand these will impact speeds.

    At this point - I am experiencing very inconsistent results which are mind boggling:

    • Download speeds are ranging between 450 mbit and 900 mbit (once! I hit 900 once!), but seem to be hovering around 600 mbit. This was tested via speedtest, via static file downloading, via usenet and via Steam (where I got the highest consistent speed of 800 mbit). Upload is stable at a meager 40 mbit (thanks, Comcast!)

    • Testing using iperf3 within my LAN yields ~480 mbit, no more, between the pfSense box and a local server. On the same switch, testing between two other machines maxes out the connection - so it's definitely not the switch. I have not ruled out the network cable, though - so that will be tested next but for the moment, lets assume it is fine.

    • PowerD is enabled; tried setting it to Adaptive, HiAdaptive, Maximum - no change.

    • Hardware checksum offload, hardware TCP segmentation offload and hardware large receive offload are disabled.

    • MTU is at default levels (not sure what values I should play with here).

    • Attempted to kill snort - to no avail.

    So there I am! There is another thing I am going to try - disable Special C1E states in the BIOS - but I don't see how that would affect anything unless FreeBSD throttles the proc down significantly due to that.

    Any other suggestions? Anyone with this board experiencing (or experienced) these kinds of issues?

    Thanks!



  • Update:

    Solved my own problem!

    Enhanced C1E should remain disabled - once I turned that off, along with ACPI 3.0 T-states, full blast ahead you go! I am at about 920 mbit which I can live with.

    Cheers :)