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Date: Fri, 26 Sep 2014 10:47:32 +0200 From: Jesper Dangaard Brouer <brouer@...hat.com> To: Eric Dumazet <eric.dumazet@...il.com> Cc: Tom Herbert <therbert@...gle.com>, Linux Netdev List <netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>, Alexander Duyck <alexander.h.duyck@...el.com>, Toke Høiland-Jørgensen <toke@...e.dk>, Florian Westphal <fw@...len.de>, Jamal Hadi Salim <jhs@...atatu.com>, Dave Taht <dave.taht@...il.com>, John Fastabend <john.r.fastabend@...el.com>, Daniel Borkmann <dborkman@...hat.com>, Hannes Frederic Sowa <hannes@...essinduktion.org>, brouer@...hat.com Subject: Re: [PATCH net-next] dql: dql_queued() should write first to reduce bus transactions On Thu, 25 Sep 2014 23:04:56 -0700 Eric Dumazet <eric.dumazet@...il.com> wrote: [...] > > It turned out the problem was caused by compiler trying to be > smart, but involving a bad MESI transaction : > [...] > > I got an incredible 10 % gain [1] by making sure cpu do not attempt > to get the cache line in Shared mode, but directly requests for > ownership. [...] > > Signed-off-by: Eric Dumazet <edumazet@...gle.com> > --- I'm very impressed - thank you Eric for finding this!!! Acked-by: Jesper Dangaard Brouer <brouer@...hat.com> -- Best regards, Jesper Dangaard Brouer MSc.CS, Sr. Network Kernel Developer at Red Hat Author of http://www.iptv-analyzer.org LinkedIn: http://www.linkedin.com/in/brouer -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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