netdev - Network hangs with 2.6.30.5

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Message-Id: <7D2F0769-2994-4BB8-B107-DEF2B1346B3A@gmail.com>
Date:	Tue, 1 Sep 2009 19:50:38 +1000
From:	Clifford Heath <clifford.heath@...il.com>
To:	netdev@...r.kernel.org
Subject: Network hangs with 2.6.30.5

I sent this email last Friday, but received no response.

As far as I can see, some recent work in the stable
Linux kernel has broken the TCP stack, at least on my
(pretty common) hardware. Can anyone confirm that
they've seen and perhaps fixed similar symptoms, or
at least tell me what else I need to do to help them
identify the problem?

I recently upgraded my Debian system (a Dell Optiplex GX270) from a  
2.6.16.11 kernel to a 2.6.30.5 one (current stable). My networking is  
now misbehaving. If I could revert to an earlier kernel, I would (and  
did, it worked), but now I can't because of the glibc version change;  
the old kernel panics on startup. This leaves me with a *broken  
computer* which I cannot use for my regular work, and cannot afford to  
completely re-install.

POP, IMAP, and NNTP connect ok (multiple packets each way, viewed  
using a logging proxy; no tcpdump but I can get one for you) but as  
soon as a message should start coming down, the connection hangs and  
then times out. I think it's the first large packet that causes this,  
and I saw that the net team have been working on some features to  
increase throughput through read aggregation or something... Whatever  
it is, it's clearly broken (on my hardware at least).

My kernel .config file and the output of "lspci" are included below.  
Thanks for any help you can give. Let me know if you need more  
information.

Clifford Heath.

lspci:
00:00.0 Host bridge: Intel Corporation 82865G/PE/P DRAM Controller/ 
Host-Hub Interface (rev 02)
00:02.0 VGA compatible controller: Intel Corporation 82865G Integrated  
Graphics Controller (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB  
UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB  
UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB  
UHCI Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB  
UHCI Controller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB2  
EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev c2)
00:1f.0 ISA bridge: Intel Corporation 82801EB/ER (ICH5/ICH5R) LPC  
Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801EB/ER (ICH5/ICH5R) IDE  
Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801EB (ICH5) SATA  
Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801EB/ER (ICH5/ICH5R) SMBus  
Controller (rev 02)
00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER  
(ICH5/ICH5R) AC'97 Audio Controller (rev 02)
01:07.0 SCSI storage controller: LSI Logic / Symbios Logic 53c810 (rev  
11)
01:09.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1  
(rev 07)
01:09.1 Input device controller: Creative Labs SB Live! Game Port (rev  
07)
01:0c.0 Ethernet controller: Intel Corporation 82540EM Gigabit  
Ethernet Controller (rev 02)

Download attachment "config" of type "application/octet-stream" (52103 bytes)