netdev - Re: Re: Re: limited network bandwidth with 3.2.x kernels

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Date:	Tue, 14 Feb 2012 00:14:46 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	alekcejk@...glemail.com
Cc:	Neal Cardwell <ncardwell@...gle.com>, netdev@...r.kernel.org
Subject: Re: Re: Re: limited network bandwidth with 3.2.x kernels

Le mardi 14 février 2012 à 01:09 +0200, alekcejk@...glemail.com a
écrit :
> В сообщении от Понедельник 13 февраля 2012 17:51:20 вы написали:
> > Hi,
> > 
> > Could you also please post a tcpdump of a "good" transfer on a 3.1.x
> > kernel to the same server? It would be nice to make sure the options
> > and advertised windows are the same in both cases.
> > 
> > neal
> 
> Hi,
> 
> Here tcpdump for 3.1.10 kernel (2.6.41.10-3.fc15.i686):
> 
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
> 01:03:59.499533 IP 213.83.42.56.60216 > AA.BB.CC.XY.50925: Flags [.], seq 1015030570:1015032018, ack 3902015221, win 46, options [nop,nop,TS val 3724352664 ecr 4211303], length 1448
> 01:03:59.499655 IP 213.83.42.56.60216 > AA.BB.CC.XY.50925: Flags [.], seq 1448:2896, ack 1, win 46, options [nop,nop,TS val 3724352664 ecr 4211303], length 1448
> 01:03:59.499665 IP AA.BB.CC.XY.50925 > 213.83.42.56.60216: Flags [.], ack 2896, win 41449, options [nop,nop,TS val 4211360 ecr 3724352664], length 0
> 01:03:59.499778 IP 213.83.42.56.60216 > AA.BB.CC.XY.50925: Flags [.], seq 2896:4344, ack 1, win 46, options [nop,nop,TS val 3724352664 ecr 4211303], length 1448

Hmm, we miss the first messages (SYN & SYNACK) to check what was
negociated.



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