Date: Fri, 5 Aug 2022 10:41:42 -0500 From: Jim King <jim@jimking.net> To: mike tancsa <mike@sentex.net>, stable@freebsd.org, kbowling@FreeBSD.org Subject: Re: igc problems with heavy traffic Message-ID: <a8192d60-2970-edb5-ce1a-c17ea875bf07@jimking.net> In-Reply-To: <3d874f65-8ce2-8f06-f19a-14cd550166e3@sentex.net> References: <fc256428-3ff1-68ba-cfcc-a00ca427e85b@jimking.net> <59b9cec0-d8c2-ce72-b5e9-99d1a1e807f8@sentex.net> <e714cd76-0aaa-3ea0-3c31-5e61badffa18@sentex.net> <86995d10-af63-d053-972e-dd233029f3bf@jimking.net> <3d874f65-8ce2-8f06-f19a-14cd550166e3@sentex.net>
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On 8/5/2022 7:48 AM, mike tancsa wrote: > On 8/5/2022 2:19 AM, Jim King wrote: >> On 8/4/2022 12:29 PM, mike tancsa wrote: >>> On 8/4/2022 1:12 PM, mike tancsa wrote: >>>> On 7/31/2022 11:41 PM, Jim King wrote: >>>>> I'm trying to use a Qnap dual port 2.5Gb NIC with FreeBSD 13.1. >>>>> FreeBSD recognizes the NIC and I'm able to connect to my LAN at >>>>> 1Gb. However, trying to push heavy traffic through the NIC >>>>> results in a temporary loss of connectivity: traffic stops and >>>>> the message "igc0: link state changed to DOWN" appears in the >>>>> system log. About 10 seconds later the message "igc0: link state >>>>> changed to UP" is logged, followed by some messages from dhclient >>>>> indicating that it has acquired a lease. At that point network >>>>> connectivity works normally, until I try to push a lot of traffic >>>>> again. I've been able to trigger this every time using iperf3 >>>>> from another PC on my LAN, and by using Ookla's speedtest client >>>>> (my Internet service is good for about 900 Mbps). >>>>> >>>> How long does it take to wedge the nic ? I have a pair of Topton >>>> routers (4 IGC NICs) back to back and a simple iperf3 test seems to >>>> work ok between the 2 units. >>>> >>> Actually, I was able to reproduce this too running iperf3 -P4 for >>> about 60 seconds. Watching via sysutils/ifstat, it does indeed drop >>> traffic when the link drops >>> >>> >> When I'm receiving traffic the wedge usually happens pretty quick. >> iperf while connected at 1Gb (I get similar results at 2.5Gb): >> > If I fiddle with the Flow Control settings it seems to make a > difference. I can do it without bouncing the link. I wonder what the > Linux driver has as default ? > > ie. > > sysctl -w dev.igc.1.fc=1 > sysctl -w dev.igc.0.fc=1 > > Does it help in your case ? > Thanks for the suggestion. Unfortunately it doesn't seem to help in my case. All four values for flow control give pretty much the same results with my iperf test. Jim
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