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Date: Fri, 13 Apr 2007 18:10:12 +0200 From: Daniel Schaffrath <danielschaffrath@....com> To: Eric Dumazet <dada1@...mosbay.com> Cc: Ben Greear <greearb@...delatech.com>, Andi Kleen <andi@...stfloor.org>, netdev@...r.kernel.org, bcrl@...ck.org Subject: Re: TCP connection stops after high load. On 2007/04/12 , at 20:19, Eric Dumazet wrote: > On Thu, 12 Apr 2007 10:59:19 -0700 > Ben Greear <greearb@...delatech.com> wrote: >> >> Here is a tcpdump of the connection in the stalled state. As you >> can see by >> the 'time' output, it's running at around 100,000 packets per >> second. tcpdump >> dropped the vast majority of these. Based on the network >> interface stats, I >> believe both sides of the connection are sending acks at about the >> same >> rate (about 160kpps when tcpdump is not running it seems). > > Warning : tcpdump can lie, telling you packets being transmited > several time. Maybe you have further pointers how come that tcpdump lies about duplicated packets? Thanks a lot, Daniel > > And yes, tcpdump slow things down because of enabling accurate > timestamping of packets. > >> >> >> 10:46:46.541490 IP 20.20.20.20.33011 > 20.20.20.30.33012: . ack 48 >> win 6132 <nop,nop,timestamp 85158912 84963208> >> 10:46:46.541494 IP 20.20.20.30.33012 > 20.20.20.20.33011: . ack 1 >> win 114 <nop,nop,timestamp 85158912 84963208> >> 10:46:46.541567 IP 20.20.20.30.33012 > 20.20.20.20.33011: . ack 1 >> win 114 <nop,nop,timestamp 85158912 84963208> >> 10:46:46.541653 IP 20.20.20.30.33012 > 20.20.20.20.33011: . ack 1 >> win 114 <nop,nop,timestamp 85158912 84963208> >> 10:46:46.541886 IP 20.20.20.30.33012 > 20.20.20.20.33011: . ack 1 >> win 114 <nop,nop,timestamp 85158912 84963208> >> 10:46:46.541891 IP 20.20.20.20.33011 > 20.20.20.30.33012: . ack 48 >> win 6132 <nop,nop,timestamp 85158912 84963208> >> 10:46:46.541895 IP 20.20.20.30.33012 > 20.20.20.20.33011: . ack 1 >> win 114 <nop,nop,timestamp 85158912 84963208> >> 10:46:46.541988 IP 20.20.20.30.33012 > 20.20.20.20.33011: . ack 1 >> win 114 <nop,nop,timestamp 85158912 84963208> - 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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