igb broken? Unexplained weirdness with intel 82576 nics on a
mahan at mahan.org
Wed May 12 14:40:34 UTC 2010
Check to make sure the links are all full-duplex. We started seeing
bad performance with the em(4) driver on our HP Proliant 360DL G5's
using 1000Mbits. It turned out that switch was setting it's port to
half-duplex and the emX interface was following suit.
> 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,
>> the slot the nic is in... All just off the top of my head.
>> On Sat, May 8, 2010 at 9:41 AM, joe <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
>> 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)
>> 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
>> in 'top' or 'systat -vm'. systat will also show the interrupt
>> for each driver, perhaps it's not doing interrupt moderation
>> 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 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.
>> freebsd-current at freebsd.org <mailto:freebsd-current at freebsd.org>
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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?
> freebsd-current at freebsd.org mailing list
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