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Open Source and information security mailing list archives
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Date: Fri, 26 Sep 2014 06:38:17 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: David Laight <David.Laight@...LAB.COM> Cc: Tom Herbert <therbert@...gle.com>, Jesper Dangaard Brouer <brouer@...hat.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> Subject: RE: [net-next PATCH 1/1 V4] qdisc: bulk dequeue support for qdiscs with TCQ_F_ONETXQUEUE On Fri, 2014-09-26 at 13:16 +0000, David Laight wrote: > OTOH it looks as though there is a big hit if you read then write > a non-present cache line. Well, this is exactly what it is about. Welcome to the club. This is a well known problem. Look at following old commit : http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3f9d35b9514da6757ca98831372518f9eeb71b33 -- 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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