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

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Message-ID: <CDAFEDABF718A54BABD0DA5476695307455062E7@SHEXMB-01.global.atheros.com>
Date:	Thu, 21 Jan 2010 13:37:41 +0800
From:	Jie Yang <Jie.Yang@...eros.com>
To:	Anders Boström <anders@...insight.net>
CC:	"ben@...adent.org.uk" <ben@...adent.org.uk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"565404@...s.debian.org" <565404@...s.debian.org>,
	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>
> Sent: Wednesday, January 20, 2010 5:27 PM
> To: Jie Yang
> Cc: ben@...adent.org.uk; netdev@...r.kernel.org;
> 565404@...s.debian.org; Xiong Huang
> 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?
>
yes, I tested NFS over TCP.
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