Port of the new em(4) to RELENG_6 and some problems with 82540EM

[Jack Vogel]

This driver CAME from a 6.X base that is thoroughly tested
here at Intel, so while I appreciate your efforts, they are
unnecessary. When the time comes to MFC I will handle it.

Regards,

Jack


On 5/16/07, Eygene Ryabinkin <rea-fbsd at codelabs.ru> wrote:
> Jack, good day.
>
> I happened to make a quick and dirty patch for your latest (for the
> 16.05.2007) em(4) driver from 7-CURRENT. I had seen that you mentioned
> TSO and 6.3, so I assume that you're going to merge the driver to
> the RELENG_6 someday, so maybe my effort may be helpful.
>
> To my problems.
>
> I have the '82540EM Gigabit Ethernet Controller' branded card
> (PWLA8390MT) and I am currently expiriencing troubles with the
> Gigabit switch (D-Link DGS-1008, the cheap one). Plugged into that
> switch I have
>
>  - broken packets and SSH messages 'Disconnecting: Corrupted MAC
>  on input.' when checksumming is turned on and gigabit speed,
>
>  - abyssmal rates for the HTTP downloads (about 10Mbit/sec) when
>  checksums are turned off and the speed is gigabit again,
>
>  - having switched the media on the adapter to the 100BaseTX
>  full-duplex, but still using the same switch the speed drops to
>  200Kbit/sec,
>
>  - using another D-Link switch (sorry, have no other brand in
>  hand) the above situation is completely reproducible.
>
>  - working in the half-duplex mode (for 10BaseT/UTP and 100BaseTX)
>  I have no problems to reach the 90% of the theoretical bandwidth
>  of the link via HTTP either with checksums enabled or disabled.
>
> So, the full-duplex mode is not usable to me now. If someone can
> help in this situation, I am all ears.
>
> I thought that new driver may introduce some fixes, but it isn't:
> the situation is the same. I will continue my investigations, but
> just in case you're interested in my port, it is available from
>
>     http://codelabs.ru/patches/fbsd/em-6.5.0-initial.patch.bz2
>
> RELENG_6 and 7-CURRENT sources were CVSupped yesterday, 16 May 2007.
> TSO-related stuff is completely disabled for the RELENG_6.
>
> My limited testing of the driver revealed no problems yet, but if
> they will arise I will report them.
> --
> Eygene
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