Eygene Ryabinkin 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.
That's what we call a self inflicted network problem.
When one end is configured full-duplex and the other end is in auto
speed/duplex and you want to set fixed speed/duplex, then you need to do
it on both ends. Otherwise the auto-negotiating side will default to
half-duplex. This is to be backwards compatible with hubs.
--
Sten Daniel Soersdal
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