I am having an almost identical issue with Ubuntu 20.04, kernel
5.4.0-40-generic. I believe it is related to the ethernet driver. I have
two almost identical computers, both running 5.4.0-40. The bad one has
the following driver:
eth0: RTL8168h/8111h, 00:e4:4f:68:0e:77, XID 541, IRQ 126
On this c
Re comment #4, I installed the latest kernel and am still having the
same issue. Kernel used:
5.8.0-050800rc5-generic #202007140715 SMP Tue Jul 14 11:18:29 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
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In my case the bug is in the receiving direction. I see no problems with
transmitting.
Here is the output of lspci -vv (for only the ethernet controller in
question) on the broken system. Below, I have the output from the
working system.
Broken system:
01:00.0 Ethernet controller: Realtek Semico
Two additional data points:
1) When I boot the "broken" computer -- i.e. the one that gets rx misses
under Linux -- into Windows, Windows can drive the Ethernet chip at full
wire speed; I get 500mbps to a WAN host over TCP. I believe this
suggests it is not a problem with the BIOS.
2) I actually
One more data point. Using the ethtool command described in comment 16
(rx-usecs 200, tx-usecs 200) I see about a 10% improvement in bandwidth
but still a large number of dropped incoming packets resulting in small
TCP congestion windows (and thus a small fraction of the overall TCP
goodput achieve
And another data point: I wiped the computer clean and installed Ubuntu
18.04.4; the problem disappeared. TCP performance was near wire speed.
Kernel:
4.15.0-111-generic #112-Ubuntu SMP Thu Jul 9 20:32:34 UTC 2020 x86_64
x86_64 x86_64 GNU/Linux
This clearly points to a regression in software, not
I tried:
echo 'performance' > /sys/module/pcie_aspm/parameters/policy
This did not improve performance or reduce packet loss.
I don't think it's right to give up and say "Well, this is a BIOS bug."
The 18.04 kernel does not exhibit this problem, nor does Windows, but
the 20.04 kernel does. It's
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