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.
HTH,
Patrick
joe 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 <j...@hostedcontent.com
<mailto:j...@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?
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