if_em and large mtu bug?

[Bjoern A. Zeeb]

On 30. May 2012, at 11:36 , Eugene Grosbein wrote:

> 30.05.2012 17:44, Bruce Cran пишет:
>> Are there any known problems with if_em and jumbo packets? I've found 
>> that my ssh connection breaks (when running dmesg etc.) if I configure 
>> the mtu to 9216 via rc.conf - but if I initially use a 1500 byte mtu and 
>> then manually configure it to 9216 then no problems occur.
>> 

That is due to another known bug;
if you check netstat -rn and the mtu there on your routes you'll figure.
if you remove your addresses/routes and re-add them after changing the mtu,
you'll see it as well.


>> I'm running the latest -current: the hardware is:
>> 
>> em0: <Intel(R) PRO/1000 Network Connection 7.3.2> port 0xdc00-0xdc1f mem 
>> 0xfbde0000-0xfbdfffff,0xfbd00000-0xfbd7ffff,0xfbddc000-0xfbddffff irq 16 
>> at device 0.0 on pci1
>> em0: Using MSIX interrupts with 3 vectors
> 
> I confirm this with FreeBSD 8.2-STABLE/amd64,
> em(4) 7.3.2, Intel PRO/1000 EB.
> 
> There is a workaround, though: ifconfig em0 -rxcsum -txcsum mtu 9000
> work from the beginning.
> 
> Eugene Grosbein
> 
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-- 
Bjoern A. Zeeb                                 You have to have visions!
   It does not matter how good you are. It matters what good you do!