[E1000-devel] Verifying that disabled K1 power state in Gigabit is in effect

[Jon N. <jo...@sq...>]

Hi,

we are experiencing some packet losses with the Intel 82579 (on a Compulab Intense PC) when running in Gb mode, both when running 2.6.32 and 3.8.
Losses are typically 40 packets/minute when running UDP traffic at about 250Mbit/s.
Some investigation show that the chip going in and out of K1 power state could cause this[1], but  I checked the e1000 code,
and it looks like that the workaround of disabling when in Gigabit mode should be in place already.

Is there any way to verify that K1 power state is indeed disabled for my particular setup? Reading out the registers etc?
Are there any other things that could explain the packet losses and be done to fix them?

Regards,
Jon Nordby

1. http://communities.intel.com/thread/32022, http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/6-and-c200-chipset-specification-update.pdf, p 24.