Help with troubleshooting low interface throughput
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Hi,
I have a symmetric gigabit internet connection; however when I perform numerous speed tests from a hardwired computer, my download speed never gets above 48 Mbps, while my upload speed bounces between 120-180 Mbps. If I connect directly to the ISP equipment (removing pfSense), speed tests show at least 500 Mbps up/down.
I am running pfSense 2.4.4-RELEASE-p1 on a PC Engines APU2 (BIOS 4.0.18). This device has three Intel NICs: one is for WAN, one is subnet A (no VLAN) and subnet B (VLANed), and the last NIC is subnet C (VLANed) and subnet D (VLANed).
Referencing the pfSense Documentation, here's the troubleshooting bullet points:
- CPU usage doesn't go above 30% during a speed test.
- System Activity doesn't show any significant usage for any IRQ process.
- MBUF hasn't gone above 2%.
- [Checked] - Disable hardware checksum offload
- [Checked] - Disable hardware TCP segmentation offload
- [Checked] - Disable hardware large receive offload
- System > Advanced > System Tunables:
- net.inet.tcp.tso=0
- kern.ipc.nmbclusters=1000000
- hw.igb.num_queues=1
- sysctl net.inet.ip.intr_queue_drops returns a 0
- I've verified all interfaces have negotiated to 1000Mbps/full duplex.
- All interfaces have the default MTU (1500).
- There are no Traffic Shaping Queues or Limiters.
- No VPN clients were connected during speed tests.
- ISP devices, pfSense, and my switch have all been rebooted.
Installed packages:
- arping
- iperf
- Netgate_Coreboot_Upgrade
- openvpn-client-export
- sudo
I know this hardware was able to handle at least 150Mbps to the internet when I first got the gigabit connection. Something has changed (probably some tweaking my part over the months/years), any help would be greatly appreciated in tracking this down. Thanks!
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Who is your ISP? Is it perhaps AT&T? If so, there was another poster on here about two months ago with similar sudden speed slowdown and it turned out to be a firmware update pushed by AT&T to his AT&T-provided modem/router.
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Ah-ha! Yes, I do have AT&T. Here's the relevant threads I just found:
- https://forum.netgate.com/topic/138604/sudden-drop-in-throughput-900-900-on-modem-vs-30-100-on-pfsense/14
- https://forum.netgate.com/topic/112691/wan-throughput-capping-at-500mbps-att-gigapower/3
- https://forums.att.com/t5/AT-T-Fiber-Equipment/DMZPlus-mode-in-my-Pace-5268AC-causing-browsing-to-not-work-but/td-p/5712305
I haven't read through all of this yet, but it all starts out matching my situation exactly. I'll report back when I get a chance to get up to speed on this and see if it turns out to be my issue.
Thanks!
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@mattzap said in Help with troubleshooting low interface throughput:
Ah-ha! Yes, I do have AT&T. Here's the relevant threads I just found:
- https://forum.netgate.com/topic/138604/sudden-drop-in-throughput-900-900-on-modem-vs-30-100-on-pfsense/14
- https://forum.netgate.com/topic/112691/wan-throughput-capping-at-500mbps-att-gigapower/3
- https://forums.att.com/t5/AT-T-Fiber-Equipment/DMZPlus-mode-in-my-Pace-5268AC-causing-browsing-to-not-work-but/td-p/5712305
I haven't read through all of this yet, but it all starts out matching my situation exactly. I'll report back when I get a chance to get up to speed on this and see if it turns out to be my issue.
Thanks!
Yep, those are some of the relevant threads. I think the user found a solution on the AT&T forums.
