igb broken? Unexplained weirdness with intel 82576 nics on a
supermicro board.
Jack Vogel
jfvogel at gmail.com
Sat May 8 18:21:50 UTC 2010
The cable, its a simple thing but make SURE you try that, a slightly
damaged one can do weird things and its quick to check, don't overlook
it.
Jack
On Sat, May 8, 2010 at 10:22 AM, joe <joe at hostedcontent.com> wrote:
> On 05/08/2010 01:53 PM, Jack Vogel wrote:
>
>> I still am not clear on this system, how many ports are on it, and its
>> an 82576?
>> Sounds to me like you've proven its not on the box if you can do fine
>> when its
>> on its own. So change ports in the switch, as I said, change cables, must
>> be
>> something in that environment.
>>
>> Jack
>>
>>
>> On Sat, May 8, 2010 at 10:04 AM, joe <joe at hostedcontent.com
>> <mailto:joe at hostedcontent.com>> wrote:
>>
>> On 05/08/2010 01:31 PM, Jack Vogel wrote:
>>
>> Looks like something to do with system C, you might isolate it,
>> and try
>> a back
>> to back connection with its NICs, change cables, look at BIOS
>> settings,
>> change
>> the slot the nic is in... All just off the top of my head.
>>
>> Jack
>>
>>
>> On Sat, May 8, 2010 at 9:41 AM, joe <joe at hostedcontent.com
>> <mailto:joe at hostedcontent.com>
>> <mailto:joe at hostedcontent.com <mailto:joe at hostedcontent.com>>>
>>
>> wrote:
>>
>> On 05/08/2010 11:17 AM, Ian FREISLICH wrote:
>>
>> joe wrote:
>>
>> On 05/08/2010 06:55 AM, Ian FREISLICH wrote:
>>
>> joe wrote:
>>
>> I have just tried your suggeston and
>> it has
>> no effect for me ;(
>>
>>
>> Do you have another brand of NIC that you can
>> try? At
>> least that
>> will isolate whether it's igb(4) or something else.
>>
>>
>> I will grab a new nic today and try...my options are
>> limited
>> though.
>> Here are the nics i can get my hands on
>>
>> TP-LINK TL-TG3468, 10/100/1000Mbps PCIe Adapter
>> (supported
>> by fbsd?)
>>
>>
>> Based on the RTL8168B chip. Should be supported by the
>> re(4)
>> driver.
>>
>> Intel (EXPI9301CT) Gigabit CT Desktop Adapter (yet
>> another
>> intel nic)
>>
>>
>> i82574L chip. Should be supported by the em(4) driver.
>> I have had
>> good performance in the past with this driver and less than
>> satisfactory performance with the igb(4) driver.
>>
>> That may not be your problem though. Before you go out
>> and buy,
>> have a look at the amount of interrupt time your slow
>> machine spends
>> in 'top' or 'systat -vm'. systat will also show the
>> interrupt rate
>> for each driver, perhaps it's not doing interrupt
>> moderation
>> properly.
>> This will manifest as more than about a 1000 per second.
>> There are
>> loader tunables for the driver to increase the number of
>> transfer
>> descriptors and to tune interrupt moderation.
>>
>> You could try running trafshow (port) on the interface
>> while
>> performing the transfer. Perhaps promiscuous mode will
>> turn off
>> some hardware feature that will improve things. It may
>> however
>> break hardware vlanning as it does on my 82575GB 4 port
>> igb card.
>>
>> Ian
>>
>> --
>> Ian Freislich
>>
>>
>> I bought those two cards anyways, im in a rush to figure out
>> this
>> problem. That being said i am still encountering the exact same
>> problem regardless on which network card i am running. I am at
>> a
>> complete loss. I am about to try a raid card to see if the
>> problem
>> might lay within the onboard sata ports. I did pull the
>> server and
>> brought it home so that i can test more things quicker.
>>
>> I am going to try using a raid card instead of the onboard sata
>> ports and see if i still encounter the same problem. I would
>> love
>> any suggestions you may have on where to go from here to
>> figure out
>> where the problem might be.
>>
>> joe
>>
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>>
>>
>> I think it might have something to so with the nics / switch, and
>> their features. I brought the box home, plugged into my gb switch,
>> and i am able to FTP data to the server at around 35MB/sec.
>>
>> I dont know what would cause this other than some sort of issue with
>> the the 3 different types of nics and the switch i am using.
>>
>> Any suggestions?
>>
>>
>>
> There are two embedded intel 82576 nics on this motherboard. I do believe i
> have proven it is not the box itself as it is capable of high incoming
> throughput. I have other servers on the switch which do 55MB/sec without
> issues. I believe it is a combination of this server and/or the nics i have
> and the switch i am using. It's the only logical explanation if i get the
> desired throughput on my home switch but not on the switch that is
> collocated. I will try updating the firmware of the switch tonight as well
> as bringing the switch i use at home with me.
>
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