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Date: Fri, 15 Apr 2016 21:40:34 +0200 From: Jesper Dangaard Brouer <brouer@...hat.com> To: Mel Gorman <mgorman@...hsingularity.net>, linux-mm <linux-mm@...ck.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Brenden Blanco <bblanco@...mgrid.com> Cc: brouer@...hat.com, tom@...bertland.com, alexei.starovoitov@...il.com, ogerlitz@...lanox.com, daniel@...earbox.net, brouer@...hat.com, eric.dumazet@...il.com, ecree@...arflare.com, john.fastabend@...il.com, tgraf@...g.ch, johannes@...solutions.net, eranlinuxmellanox@...il.com Subject: FlameGraph of mlx4 early drop with order-0 pages Hi Mel, I did an experiment that you might find interesting. Using Brenden's early drop with eBPF in the mxl4 driver. I changed the mlx4 driver to use order-0 pages. It usually use order-3 pages to amortize the cost of calling the page allocator (which is problematic for other reasons, like memory pin-down, latency spikes and multi CPU scalability) With this change I could do around 12Mpps (Mill packet per sec) drops, usually does 14.5Mpps (limited due to a HW setup/limit, with idle cycles). Looking at the perf report as a FlameGraph, the page allocator clearly show up as the bottleneck: http://people.netfilter.org/hawk/FlameGraph/flamegraph-mlx4-order0-pages-eBPF-XDP-drop.svg Signing off, heading for the plane soon... see you at MM-summit! -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat Author of http://www.iptv-analyzer.org LinkedIn: http://www.linkedin.com/in/brouer
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