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

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Message-Id: <20100118.154347.314005348620400016.anders@netinsight.net>
Date:	Mon, 18 Jan 2010 15:43:47 +0100 (CET)
From:	Anders Boström <anders@...insight.net>
To:	ben@...adent.org.uk, netdev@...r.kernel.org, 565404@...s.debian.org
Cc:	xiong.huang@...eros.com, jie.yang@...eros.com
Subject: Re: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

>>>>> "BH" == Ben Hutchings <ben@...adent.org.uk> writes:

 BH> On Fri, 2010-01-15 at 14:25 +0100, Anders Boström wrote:
 >> When I run NFS over TCP (default options) and read large files from a
 >> server with Atheros AR8121/AR8113/AR8114 Ethernet chip, I only get

 BH> Do you know which specific chip it is?

No, the only information I have is what I get from lspci:

03:00.0 Ethernet controller: Attansic Technology Corp. Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller (rev b0)
        Subsystem: ASUSTeK Computer Inc. Device 831c

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.

 BH> Please can you send a longer packet capture in pcap format?

Yes, it is attached. Packet 26 in the capture is the offending one.

/ Anders
Download attachment "bad_IP_head_packet_sequence.pcap" of type "Application/Octet-Stream" (38418 bytes)