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

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Date:	Wed, 20 Jan 2010 10:27:04 +0100 (CET)
From:	Anders Boström <anders@...insight.net>
To:	Jie.Yang@...eros.com
Cc:	ben@...adent.org.uk, netdev@...r.kernel.org,
	565404@...s.debian.org, Xiong.Huang@...eros.com
Subject: Re: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

>>>>> "JY" == Jie Yang <Jie.Yang@...eros.com> writes:

 JY> 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.

 JY> 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.
 JY> with hardware, Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller (rev b0)
 JY> device id : 1969:1026 (rev b0)

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

Have you tested NFS over TCP? The block-size the application uses can
have an effect on this. What application did you use? Block-size?

/ Anders
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