In light of my previous findings I did a dual boot install with 15.10
and 16.04. I put both installs on 4.3.6 mainline kernel and found that
15 was fine and 16 was not. I started looking at installed packages and
tried to isolate some packages. After uninstalling several and
rebooting I found that my performance went back up to normal. Long
story short I found that uninstalling libnuma1 (which also uninstalls
irqbalance) solved the problem after a reboot. FYI simply killing the
irqbalance task did not solve the problem. I haven't taken time to
troubleshoot further but it's something with numa/interrupt processing
that is taking too long or something. Reinstalling irqbalance/libnuma1
causes the problem again. This is a single Xeon CPU on a dual CPU
board.
** Changed in: irqbalance (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1698454
Title:
TCP/IP Throughput Limitation
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