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Date: Wed, 20 Jun 2012 10:21:47 +0200 From: Stefan Priebe - Profihost AG <s.priebe@...fihost.ag> To: Eric Dumazet <eric.dumazet@...il.com> CC: Linux Netdev List <netdev@...r.kernel.org> Subject: Re: 10GBE performance drop with net.ipv4.tcp_timestamps=0 Am 20.06.2012 09:22, schrieb Eric Dumazet: > On Wed, 2012-06-20 at 09:00 +0200, Stefan Priebe - Profihost AG wrote: >> Am 19.06.2012 23:31, schrieb Eric Dumazet: >> Before: >> http://pastebin.com/raw.php?i=1gVraWVc >> >> After: >> http://pastebin.com/raw.php?i=NSh8Y29s > > You have a lot of packet losses But this ONLY happens with tcp_timestamps=0. > add "tc -s -d qdisc" , "ifconfig -a " and "ethtool -S ethX" outputs for > both servers eth2 is the 10Gb device on both systems server a has kernel 3.5 server b has rhel 6 kernel Server A: # tc -s -d qdisc RTNETLINK answers: Operation not supported Dump terminated Server B (eth2 is the 10GB/s device): # tc -s -d qdisc qdisc mq 0: dev eth0 root Sent 55151 bytes 555 pkt (dropped 0, overlimits 0 requeues 0) rate 0bit 0pps backlog 0b 0p requeues 0 qdisc mq 0: dev eth2 root Sent 38374148475 bytes 2774405 pkt (dropped 0, overlimits 0 requeues 4) rate 0bit 0pps backlog 0b 0p requeues 4 ifconfig -a: http://pastebin.com/raw.php?i=M3QHQjSU ethtool -S: http://pastebin.com/raw.php?i=Eap05xKc Thanks again, Stefan -- 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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