[E1000-devel] High latency problem with 82579LM

[Valtteri K. <val...@da...>]

Hello,

I found this contact information from Linux kernel 3.6.0 sources, so I 
dont know if this is the right place to inform this, but I already have 
tried Intel support and it was pointless. Just got bounced from one 
place to another.

I'am using the latest Linux kernel 3.6.0 and Intel desktop motherboard 
DQ77MK with dual-port 82579LM NIC. I'm having strange high latency / 
packet loss problem when both of the NIC ports have been enabled in 
BIOS. If only one port is enabled (the default NIC port with also has 
Intel AMT). everything works fine, the Intel AMT too.

However, if I enable both of the ports I get a high latency and packet 
loss problems with BOTH of the NIC's, so the IP-address assigned to the 
Intel AMT port is lagging and also the IP-address assigned to the other 
port is lagging. Right after reboot the there is no problems, but it 
will quickly start packetlossing and it gets gradually worse by time. 
After 2 hours of uptime it becomes nearly unusable.

Hardware information:

CPU: Intel Core i7-3770
MB: Intel DQ77MK
BIOS: latest version 0050 (MKQ7710H.86A)
OS: Debian GNU/Linux squeeze with latest Linux kernel 3.6.0
Other notes: PCI-E power management (ASPM) is disabled. Intel AMT is 
enabled. ACPI is enabled.

I have also posted a thread about this to Intel community forums: 
http://communities.intel.com/thread/32060

I dont know if this is a problem with BIOS or the driver, but I would 
suspect that this might be a BIOS problem, but it could probably maybe 
be a driver/IRQ problem also.

In case this is a BIOS problem I'am really hoping that someone would 
have the ability to redirect this problem to the guys who are 
responsible of the BIOS development of this DQ77MK motherboard, since 
Intel support seems unable to process this issue, and I dont anymore 
know who to contact :/

I will gladly answer any guestions reagarding this problem.

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With best regards,
Valtteri Kiviniemi