Date: Mon, 24 Sep 2018 15:00:09 +0300 From: Lev Serebryakov <lev@FreeBSD.org> To: net@FreeBSD.org Cc: marius@FreeBSD.org Subject: I210/igb is limited by flow control and reset fc setting on MTU change (11-STABLE) Message-ID: <1a105a92-63d4-5cf4-45e6-59cbf2f61798@FreeBSD.org>
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My 11-STABLE system with igb (I210) can not send more than 710Mbit/s with single TCP stream until I disable flow control (sysctl dev.igb.0.fc=0). After that it shows full-speed and there is no collisions. Other system with I210 doesn't show this behavior. What is worse, after ifconfig igb0 mtu 1500 down up ifconfig igb0 mtu 9000 down up it is limited again, looks like this action sequence reset flow control setting (but not sysctl, it is still 0). sysctl dev.igb.0.fc=3 dev.igb.0.fc=0 helps till next MTU switch. -- // Lev Serebryakov
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