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Message-ID: <1356810062.21409.4991.camel@edumazet-glaptop> Date: Sat, 29 Dec 2012 11:41:02 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: Andrew Vagin <avagin@...allels.com> Cc: netdev@...r.kernel.org, vvs@...allels.com, Michał Mirosław <mirq-linux@...e.qmqm.pl> Subject: Re: Slow speed of tcp connections in a network namespace On Sat, 2012-12-29 at 19:58 +0100, Eric Dumazet wrote: > Le samedi 29 décembre 2012 à 09:40 -0800, Eric Dumazet a écrit : > > > > > Please post your new tcpdump then ;) > > > > also post "netstat -s" from root and test ns after your wgets > > Also try following bnx2 patch. > > It should help GRO / TCP coalesce > > bnx2 should be the last driver not using skb head_frag And of course, you should make sure all your bnx2 interrupts are handled by the same cpu. Or else, packets might be reordered because the way dev_forward_skb() works. (CPU X gets a bunch of packets from eth0, forward them via netif_rx() in the local CPU X queue, NAPI is ended on eth0) CPU Y gets a bunch of packets from eth0, forward them via netif_rx() in the local CPU Y queue. CPU X and Y process their local queue in // -> packets are delivered Out of order to TCP stack Alternative is to setup RPS on your veth1 device, to force packets being delivered/handled by a given cpu -- 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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