netdev - RE: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

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Date:	Wed, 20 Jan 2010 14:03:38 +0800
From:	Jie Yang <Jie.Yang@...eros.com>
To:	Anders Boström <anders@...insight.net>,
	"ben@...adent.org.uk" <ben@...adent.org.uk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"565404@...s.debian.org" <565404@...s.debian.org>
CC:	Xiong Huang <Xiong.Huang@...eros.com>
Subject: RE: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

Anders Boström <anders@...insight.net> wrote:

> It is an ASUS M4A78 PRO motherboard with the Atheros
> AR8121/AR8113/AR8114 on-board.
>
>  >> ~25Mbyte/s performance. I get ~5000 retransmitted packets
> per GByte  >> data, according to RetransSegs in
> /proc/net/snmp . wireshark in the  >> client show that the
> server send out a sequence of frames. All but the  >> last
> one are 1500 bytes IP-packets. The last one is shorter, but
> the  >> IP-header still say 1500 byte. The client then
> requests retransmit,  >> and the retransmitted frame arrives
> with correct IP-header.

i just test it on Linux localhost.localdomain 2.6.31.5-127.fc12.x86_64 #1 SMP Sat Nov 7 21:11:14 EST 2009 x86_64 x86_64 x86_64 GNU/Linux.
with hardware, Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller (rev b0)
device id : 1969:1026 (rev b0)

i upload/download a 382M it work well with retransmit packet:

Tcp: RtoAlgorithm RtoMin RtoMax MaxConn ActiveOpens PassiveOpens AttemptFails EstabResets CurrEstab InSegs OutSegs RetransSegs InErrs OutRsts
Tcp: 1 200 120000 -1 2 4 2 0 2 532501 220631 6 0 2

I also test it on kernel 2.6.33-rc1 sync from git. but it fail to boot kernel

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