On 07/07/12 15:18, Camaleón wrote:
On Fri, 06 Jul 2012 09:46:33 +0100, Berni Elbourn wrote:
11:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5722
Gigabit Ethernet PCI Express
With standard squeeze kernel seemingly once a day this nic stops
working. Looking at the switch port it seems the nic is transmitting (or
retransmitting) something as fast as possible. A simple ifdown/ifup
seems to cure for another day.
On latest backport kernel 3.2.20-1~bpo60+1 (installed today) the nic
does seems to be stable. iperf reports 1gb performance. However the
count of dropped packets is slowly growing:
(...)
RX packets:8801144 errors:0 dropped:1824 overruns:0 frame:0
(...)
This issue is present in the firmware nonfree from stable, and
backports, and the using the latest source compiled from broadcom
3.122n. I have changed cables and switch ports. There is another other
gigabit nic on the switch is nVidia Corporation MCP77 and this has no
errors or dropped packets.
So you have tested with almost all of the possibilities (you've discarded
a hardware issue by replacing the patch cord and using a different switch
port and you've discarded a software/driver problem by installing a
different kernel and the latest available broadcom driver) yet still you
don't see a noticeable improvement on this, right? Then it can be
something specific to your setup/environment... I would start with the
ouput of "ethtool eth0" and "ethtool -k eth0" just in case.
Have you noted an increment of packets being dropped when the system is
running a concrete task or process that can exhaust the available memory?
I ask this because Google suggest that dropped packates can be related to
low memory situations :-?
Anyone else seeing this? How to progress? .. should I log a debian bug,
or just go buy an Intel card? Or ? :-)
In workstations and servers I always try to have at least a couple of
different NIC cards (from different manufacturers and models) just to
prevent these situations, because if you think about it, what's a server
with no network connection? Nowadays, close to nothing; a toaster is even
more useful :-)
Greetings,
Strangest thing. The dropped packets stopped at 3000 odd. After reboots (this machine is shutdown overnight) the number
of dropped packets seems to stop incrementing at 20 or 30 or so even after several gigabytes of transfer.
Performance however is fine with the backports kernel:
$ cat /proc/version
Linux version 3.2.0-0.bpo.2-amd64 (Debian 3.2.20-1~bpo60+1) (debian-ker...@lists.debian.org) (gcc version 4.4.5 (Debian
4.4.5-8) ) #1 SMP Fri Jun 29 20:42:29 UTC 2012
$ sudo ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: g
Wake-on: g
Current message level: 0x000000ff (255)
Link detected: yes
$ sudo ethtool -k eth0
Offload parameters for eth0:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
ntuple-filters: off
receive-hashing: off
$ sudo ethtool -i eth0
driver: tg3
version: 3.121
firmware-version: 5722-v3.07, ASFIPMI v6.02
bus-info: 0000:11:00.0
eth0 Link encap:Ethernet HWaddr 00:21:5a:d3:d0:0c
inet addr:192.168.2.10 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::221:5aff:fed3:d00c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:123154 errors:0 *dropped:26* overruns:0 frame:0
TX packets:131936 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:15913111 (15.1 MiB) TX bytes:107913843 (102.9 MiB)
Interrupt:19
--
"Confidence is what you have before you understand a problem" - Woody Allen
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