Hi Waskiewicz,
Thanks for the information, that helps lot.
Regards,
Lakshmana
Waskiewicz Jr, Peter P wrote:
On Wed, 9 Sep 2009, Lakshmana Reddy wrote:
Hi,
The Rx throughput of 82599 NIC on PCIe Gen1 limits to 6.5 and 7.5Gbps
with mtu 1500 and 9000 respectively.
On PCIe Gen2 the throughput seems to be ok (reaches line rate). However,
I should mention that, I dont have a PCIe Gen2 slot on the same machine
but on a different machine with PCIe Gen2 the throughput is good (line
rate).
Is this a known issue?
Yes. There is a hardware errata in 82599 on PCIe gen1 systems. In a
nutshell, there are extra clocks in the PCIe block that chew up a
percentage of the bus bandwidth, which ultimately limits the throughput of
the NIC. These extra "dead" clocks are the errata. There is nothing we
can do about it unfortunately.
There are two recommendations here:
1) Run the 82599 in a Gen2 slot.
2) In your case, where you don't have a Gen2 slot in that box, use an
82598, which has no trouble running at line rate in a Gen1 slot.
Any help is greatly appreciated!
Apologies that I don't have better news for you.
Cheers,
-PJ waskiewicz
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