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Date: Sat, 19 May 2012 04:03:13 -0400 (EDT) From: David Miller <davem@...emloft.net> To: eric.dumazet@...il.com Cc: netdev@...r.kernel.org, tore@....no Subject: Re: [PATCH net-next] ipv6: disable GSO on sockets hitting dst_allfrag From: Eric Dumazet <eric.dumazet@...il.com> Date: Sat, 19 May 2012 09:51:44 +0200 > From: Eric Dumazet <edumazet@...gle.com> > > If the allfrag feature has been set on a host route (due to an ICMPv6 > Packet Too Big received indicating a MTU of less than 1280), we hit a > very slow behavior in TCP stack, because all big packets are dropped and > only a retransmit timer is able to push one MSS frame every 200 ms. > > One way to handle this is to disable GSO on the socket the first time a > super packet is dropped. Adding a specific dst_allfrag() in the fast > path is probably overkill since the dst_allfrag() case almost never > happen. > > Result on netperf TCP_STREAM, one flow : > > Before : 60 kbit/sec > After : 1.6 Gbit/sec > > Reported-by: Tore Anderson <tore@....no> > Signed-off-by: Eric Dumazet <edumazet@...gle.com> > Tested-by: Tore Anderson <tore@....no> Applied. -- 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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