Package: systemd Version: 232-23 ​Severity: important​ With systemd 232 it got the ability to set the NIC offloads. These offloads are not initialized correctly though, so the NIC ends up without fully enabled TCP offloads.
Example from stretch defaults: ... tcp-segmentation-offload: on tx-tcp-segmentation: off <---- ??? tx-tcp-ecn-segmentation: off [fixed] tx-tcp-mangleid-segmentation: off tx-tcp6-segmentation: on udp-fragmentation-offload: off [fixed] generic-segmentation-offload: on ... If I do the following (default in 231 and earlier): ethtool -K <if> tx-tcp-segmentation on I get the correct version ... tcp-segmentation-offload: on tx-tcp-segmentation: on tx-tcp-ecn-segmentation: off [fixed] tx-tcp-mangleid-segmentation: off tx-tcp6-segmentation: on udp-fragmentation-offload: off [fixed] generic-segmentation-offload: on ... This causes major performance issues in high speed networks (1Gbit/s and higher) or in weak embedded devices and it is going to be (by accident) the default in Stretch! Luckily the fix is already in 233 and it is only a simple one liner that I really think should be patched into Stretch to avoid people getting hard to diagnose distro specific performance issues when going from jessie to stretch or coming from other distros. Some links with info: * https://github.com/systemd/systemd/issues/4650 * https://github.com/systemd/systemd/pull/4639 * https://sourceforge.net/p/e1000/mailman/message/35663858/ Regards, Hans-Kristian Bakke