High CPU usage after upgrading from Debian 7 to Debian 9

From	Алексей <rbl@ukr.net>
Newsgroups	linux.debian.isp
Subject	High CPU usage after upgrading from Debian 7 to Debian 9
Date	2019-04-15 10:30 +0200
Message-ID	<xN5a1-1mZ-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi!

I have two Debian boxes acting as a routesr (+iptables +quagga(BGP)). I have updated one from Debian 7 to Debian 9 recently and now experience 2x CPU utilization on the same amounts of traffic, e.g. on normal load of 1Gbps (real-world traffic) Debian 7 had 5-6% and Debian 9 has 10-12% softirq CPU time. This behaviour can also be observed during tests - 6Gbps iperf gets 3% on Debian 7 and 6% on Debian 9.

I compared ethtool -k outputs on both boxes and they are pretty similar. Syslog doesn't show anything suspicious.

Did anyone have the similar issue? Or can give me some advice on troubleshooting?

Any help will be appreciated.

Cheers,
Alex

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High CPU usage after upgrading from Debian 7 to Debian 9 Алексей <rbl@ukr.net> - 2019-04-15 10:30 +0200
  Re: High CPU usage after upgrading from Debian 7 to Debian 9 Matus UHLAR - fantomas <uhlar@fantomas.sk> - 2019-04-15 10:50 +0200
    Re[2]: High CPU usage after upgrading from Debian 7 to Debian 9 Алексей <rbl@ukr.net> - 2019-04-16 16:30 +0200
      Re: High CPU usage after upgrading from Debian 7 to Debian 9 Matus UHLAR - fantomas <uhlar@fantomas.sk> - 2019-04-17 13:20 +0200

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