kern/78791: [xl] xl(4) input errors and speed problem

Sten Daniel Soersdal netslists at
Sun Aug 5 20:05:47 UTC 2007

Gleb Smirnoff wrote:
> On Thu, Aug 02, 2007 at 02:21:39PM -0300, Daniel Dias Gon?alves wrote:
> D> > State-Changed-From-To: open->feedback
> D> > State-Changed-By: glebius
> D> > State-Changed-When: Tue Dec 27 09:03:50 UTC 2005
> D> > State-Changed-Why: Please provide the following information. Is this one 
> D> > particular card
> D> > that experiences errors, or you have tested several 3Com cards and all
> D> > fail?
> D> >
> D>  I have same problem, and is not only with card 3com (xl), also with Intel 
> D>  card (fxp).
> D>  In my servers running FreeBSD 6.1, have constant traffic of +-80mbps and 
> D>  "input errors" (netstat - ni) always increases, use crossover cables and the 
> D>  interfaces fixed "100baseTX-FDX".
> D>  Frequently with Intel card (fxp), i have that to make ifconfig DOWN/UP in 
> D>  the interface to come back to work.
> D> 
> D>  Which the solution for these problems ?
> I think the problem, you've described isn't the same problem as in kern/78791.

I haven't used this card in a long time and i don't know if TX/RX 
checksum offloading is supported in the FreeBSD driver. Just to sum up 
my findings.

Checksum offloading is bugged, even on windows drivers. Disabling 
checksum offloading has always resulted in much better performance.

Also, when you say using "100baseTX-FDX" you mean between the servers 
and not via a switch, right?

Sten Daniel Soersdal

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