Branch: refs/heads/scale Home: https://github.com/kronosnet/kronosnet Commit: af84b6a87494a1f2067e89a0e298981e740fa3e0 https://github.com/kronosnet/kronosnet/commit/af84b6a87494a1f2067e89a0e2989… Author: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Date: 2018-01-03 (Wed, 03 Jan 2018) Changed paths: M libknet/links.c Log Message: ----------- [stats] report correct MTU for loopback links Signed-off-by: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Commit: d0014fe1827589cca815bb9a38a3dd84f0243a52 https://github.com/kronosnet/kronosnet/commit/d0014fe1827589cca815bb9a38a3d… Author: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Date: 2018-01-03 (Wed, 03 Jan 2018) Changed paths: M libknet/handle.c M libknet/internals.h M libknet/threads_pmtud.c M libknet/transport_udp.c Log Message: ----------- [PMTUd] Use kernel MTU information to determine next packet size during discovery Using this information we can, for good links (*), determine and verify the link MTU with 2 packets. * good links means: node X has MTU Y configured on a given interface. Any network object between node X and destination is capable of handling MTU >= Y. In no case the kernel will allow us to send packets > Y. Signed-off-by: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Commit: 25f58ef99800143145e2144ba325b9c8aeba2bbd https://github.com/kronosnet/kronosnet/commit/25f58ef99800143145e2144ba325b… Author: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Date: 2018-01-03 (Wed, 03 Jan 2018) Changed paths: M libknet/links.c Log Message: ----------- [PTMUd] by using a safe PMTU to init a link, we can shave down corosync membership creation by 25% tested on a 9 node cluster with 2 links each node, going down from 4 seconds to 3 seconds Signed-off-by: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Commit: e679629f2fbb9cac4a8b953bee0e603ff2163de2 https://github.com/kronosnet/kronosnet/commit/e679629f2fbb9cac4a8b953bee0e6… Author: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Date: 2018-01-03 (Wed, 03 Jan 2018) Changed paths: M libknet/internals.h M libknet/threads_common.c M libknet/threads_pmtud.c Log Message: ----------- [PMTUd] rename pmtud_running to pmtud_waiting Signed-off-by: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Commit: ec57f2c5ba10950c837dcffff2c15f097911c973 https://github.com/kronosnet/kronosnet/commit/ec57f2c5ba10950c837dcffff2c15… Author: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Date: 2018-01-03 (Wed, 03 Jan 2018) Changed paths: M libknet/internals.h M libknet/tests/knet_bench.c M libknet/threads_pmtud.c M libknet/transport_udp.c Log Message: ----------- [PTMUd] if any threads receives a EMSGSIZE outside of a PMTUD run, force PTMUd to run Scenario: node X has MTU Y on the interface and application is sending packets with size >= Y. The interface MTU is suddenly reduced to < Y Before this change, the kernel would be dropping packets till the next PMTUd run. After this change, the PMTUd will be informed that it has to rerun (overriding the pmtud_interval), reducing the packet drop to a minimum. How to test: force knet_bench to send 1500 size packets with ping_data (requires code change) and start it. reduce MTU on the interface from 1500 to 1300 (for example) Notice an immediate trigger of PMTUd run in debug mode Note: going up, from 1300 to 1500 will wait for the next PMTUd re-run as there is no immediate way to detect this change unless we start listening to kernel netlink sockets with libnl3 (investigation in progress but not critical enough atm). Signed-off-by: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Commit: 5b89b3173c0ce3157c5d38e9e1ace92bdc504bf9 https://github.com/kronosnet/kronosnet/commit/5b89b3173c0ce3157c5d38e9e1ace… Author: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Date: 2018-01-03 (Wed, 03 Jan 2018) Changed paths: M libknet/transport_udp.c Log Message: ----------- [PMTUd] make PMTUd force_run notification more quiet Signed-off-by: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Commit: 063dcdf74daa1bc4525a2b1ac86cc37b0514404b https://github.com/kronosnet/kronosnet/commit/063dcdf74daa1bc4525a2b1ac86cc… Author: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Date: 2018-01-03 (Wed, 03 Jan 2018) Changed paths: M libknet/threads_common.c Log Message: ----------- [PMTUd] if PMTUd is rescheduled, then enforce a new run the usleep between each PMTUd run will give time to the other threads to grab the wrlock Signed-off-by: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Commit: 28b4140b2395af863a16a75fb7d551c3feabbf31 https://github.com/kronosnet/kronosnet/commit/28b4140b2395af863a16a75fb7d55… Author: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Date: 2018-01-03 (Wed, 03 Jan 2018) Changed paths: M libknet/threads_pmtud.c Log Message: ----------- [PMTUd] generate warning when there is a timeout receiving a response Signed-off-by: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Commit: e51aad809d896b46ee6850e24055eb993c25383c https://github.com/kronosnet/kronosnet/commit/e51aad809d896b46ee6850e24055e… Author: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Date: 2018-01-03 (Wed, 03 Jan 2018) Changed paths: M libknet/threads_pmtud.c Log Message: ----------- [PMTUd] amend warning message Signed-off-by: Fabio M. Di Nitto &lt;fdinitto(a)redhat.com&gt; Compare: https://github.com/kronosnet/kronosnet/compare/e1e86bf65213...e51aad809d89