Maximum 200 MB/Sec with X520-T2 Cards... ???

[idata]

Hi, we have installed in our company 6 server wiht the X520-T2 (SPF+) cards and DELL 10Gbit switches and EqualLogic SANs... all nice, ut i got only a average transfer rate, measured with iperf, of 200 MB/sec...??

Ok, i have created another test scenario^with one dell and one ibm server (16 cores, 32gb ram) and connected the 2 server via a SPF+ (cable from dell) direct without any switch, same result ~200 MB/Sec.

We checked the packets with wireshark and all are jumbo frames without truncation and wihtout defragmentation.

the os for the test was windows 2008 r2 and windows 2008 64bit with a fresh installation and the intel driver from the homepage.

all offload settings in the drivers was disabled.

anyone a idea why i'm get this poor transfer rates???

i have the same speed with vmware, xenserver and windows 7 on 5 different machines...

whats the trick' is this a cable problem?

thank you for any tips for this boring problem.

Volkan

[idata]

No one a idea for me

Volkan

[vt5]

some tips:

-ensure pci-e slot is x8 configured, update bios if needed

-tune the tcp window size

you can also check out this site - http://www.intel.com/support/network/sb/CS-025829.htm http://www.intel.com/support/network/sb/CS-025829.htm

[idata]

Thank you sage99, one of the server are a dell R410 and has a speed of x16 > http://www.dell.com/us/en/enterprise/servers/server-poweredge-r410/pd.aspx?refid=server-poweredge-r410&cs=555&s=biz http://www.dell.com/us/en/enterprise/servers/server-poweredge-r410/pd.aspx?refid=server-poweredge-r410&cs=555&s=biz

I have not found a special settings for the PCIe bus...?

The document about optimizing the nics i have tryed before without any success, has the X520 cards any hidden bios/firmware settings?

i have not seen on boot for a key to enter, to enter the menu like other hba/scsi/nic card.

???

Volkan