On 7/6/2016 1:09 PM, Roland Dreier wrote: > 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 > I *just* came back from PTO. I'm still working through my email (where I saw your writeup of this issue). I didn't get very far with the issue back in May, but that's because I didn't have a lot of the background information you supplied in the other thread and didn't have the time to dig it out on my own. I could probably make some progress now. -- Doug Ledford <dledford@xxxxxxxxxx> GPG Key ID: 0E572FDD
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