Bug#864073: TCP offloads disabled by default
Hi Hans-Kristian Am 04.06.2017 um 01:56 schrieb Hans-Kristian Bakke: > 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. Thanks for making us aware of this issue and providing such a detailed bug report. This looks indeed like something which should be fixed for stretch. I intend to pull the patch, I'm just not sure if it will still make it into 9.0 given the impeding release or will have to wait for the first point release 9.1 Regards, Michael -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth? signature.asc Description: OpenPGP digital signature
Bug#864073: TCP offloads disabled by default
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 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
