netdev - Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility workaround

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Date:	Thu, 28 Aug 2008 18:49:19 -0300
From:	Dâniel Fraga <fragabr@...il.com>
To:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Cc:	David Miller <davem@...emloft.net>, thomas.jarosch@...ra2net.com,
	billfink@...dspring.com, Netdev <netdev@...r.kernel.org>,
	Patrick Hardy <kaber@...sh.net>,
	netfilter-devel@...r.kernel.org, kadlec@...ckhole.kfki.hu
Subject: Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility
 workaround

On Tue, 26 Aug 2008 23:40:58 +0300 (EEST)
"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> wrote:

> while [ : ]; do
> 	date "+%s.%N"
> 	cat /proc/net/{netstat,snmp,tcp}
> 	sleep 1
> done

	Ok; Let's try again, now with more data (I hope):

	1) tcpdump (just port 995):

http://www.abusar.org/stall/dump-client
http://www.abusar.org/stall/dump-server

http://www.abusar.org/stall/dump-server-loopback

	I don't know if loopback is useful, just in case...

	2) the above script :

http://www.abusar.org/stall/script-client-log.txt
http://www.abusar.org/stall/script-server-log.txt

	3) and strace from the client Claws Mail:

http://www.abusar.org/stall/strace-client-claws-mail.txt

	I forgot to use the -r option in strace. But when Claws-mail
stalls, it gives the following multiple times:

read(4, 0xf48704, 4096)                 = -1 EAGAIN (Resource temporarily unavailable)
select(5, [4], [4], NULL, NULL)         = 1 (out [4])
writev(4, [{"xxxxxxxxxxxxxxx"..., 108}], 1) = 108
select(5, [4], [], NULL, NULL)          = 1 (in [4])
read(4, "xxxxxxxxxxxxxxxxxxxxxx"..., 4096) = 108

	Well, I hope this time you have more information and I hope I didn't forget anything. 
If not, let's keep trying.

	Important: these data were collected with frto disabled (0) and htb disabled too. So
it isn't related to frto, neither htb.

	Thank you!

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