New: 8139too - packets dropped/lost by ethernet stack

Bugme-new Andrew Morton 1 participant 1 message Jul 28, 2009 1 message not in the archive

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Andrew Morton

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2009-07-28 22:27 UTC #1 lore raw

(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).

Quoted 62 lines · On Sun, 26 Jul 2009 10:32:52 GMT [email protected] wrote:

http://bugzilla.kernel.org/show_bug.cgi?id=13830
           Summary: 8139too - packets dropped/lost by ethernet stack
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.28, 2.6.31
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Network
        AssignedTo: [email protected]
        ReportedBy: [email protected]
        Regression: No
I'm losing receive packets with the 8139too REALTEK driver when I place the driver under load.
Details:
distribution: Ubuntu Jaunty 9.04, Ubuntu Karmic Alpha-3.
eth0 Link encap:Ethernet HWaddr 00:1b:38:08:7f:d3
          inet addr:192.168.2.3  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::21b:38ff:fe08:7fd3/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9164 errors:94 dropped:94 overruns:94 frame:0
          TX packets:7497 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:12058463 (12.0 MB)  TX bytes:792762 (792.7 KB)
          Interrupt:21 Base address:0x2000 
Dmesg details
[    4.357046] 8139cp: 10/100 PCI Ethernet driver v1.3 (Mar 22, 2004)
[    4.357092] 8139cp 0000:05:01.0: This (id 10ec:8139 rev 10) is not an 8139C+ 
compatible chip, use 8139too
[    4.359452] 8139too Fast Ethernet driver 0.9.28
[    4.359513] 8139too 0000:05:01.0: PCI INT A -> GSI 21 (level, low) -> IRQ 21
[    4.359527] 8139too 0000:05:01.0: setting latency timer to 64
[    4.360886] eth0: RealTek RTL8139 at 0x2000, 00:1b:38:08:7f:d3, IRQ 21
[    4.360889] eth0:  Identified 8139 chip type 'RTL-8100B/8139D'
The problem appears to goes away if I enable just the debug message at the end of the function in the interrupt handler (rtl8139_interrupt) which sort of suggests that something is coming into the driver faster than it can handle or it is missing a state somewhere.
(I get much better throughput with the debug message on than without it).
Also none of the error counters appear to be incremented by the driver itself - suggesting again that the higher level is expecting something the driver isn't providing.
Bug 10682 may be related (http://bugzilla.kernel.org/show_bug.cgi?id=10682) but isn't exactly the same.
More details at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/401891