Hi, https://bugzilla.kernel.org/show_bug.cgi?id=111921 describes a performance regression introduced by commit 9207f9d45b0a ("net: preserve IP control block during GSO segmentation"). I've recently run into this when updating my system, since that commit hit stable kernel 4.4.y — in my case I noticed because scp over an IPoIB link went from ~200 MB/sec down to below 1 MB/sec. I confirmed that reverting that change did fix my performance. Obviously just reverting that commit isn't the right answer, since I believe the patch description that says the commit fixes a crash. However before I start working on this myself, I want to make sure I'm not duplicating anyone else's work. Doug, you mentioned having time to work on it back in May — did you figure anything out? Or is anyone else investigating this? Thanks, Roland -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
