From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joe Buehler Date: Mon, 04 Dec 2017 16:41:15 -0500 Subject: [Intel-wired-lan] ixgbevf RX latency outliers Message-ID: <5A25C0FB.10006@cox.net> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: I am using the ixgbevf driver shipped with the 4.4.86 LINUX realtime-patched kernel in a VM using SRIOV. The kernel is timestamping incoming frames and in general is doing a great job but I am having some difficulties with RX latency outliers. Presumably something is not servicing the NIC in a timely fashion, or the NIC is holding on to frames too long. I am looking for some info on the design of the driver, the intent being perhaps to change NIC config, revise RT priorities and/or thread affinities. There appear to be 3 IRQ threads for example -- what are they for? Any help much appreciated. Joe