Fedora 18 network freeze after a while...

[Georgios Petasis]

Στις 5/3/2013 8:55 μμ, ο/η Rick Stevens έγραψε:
> On 03/05/2013 10:31 AM, Georgios Petasis issued this missive:
>> Hi all,
>>
>> I am facing a very strange problem after upgrading to fedora 18: while
>> the system works ok (I use the machine through vnc),
>> after some time (which can range from 30 minutes to a few hours) all
>> network interaction rapidly deteriorates, until network is no
>> more useful (i.e. I cannot even ssh to the machine).
>>
>> How can I find out why this is happening? I didn't had any problems with
>> fedora 17, and I have tested the RAM, which showed no errors.
>
> Need more info:
>
> 1. Wired or wireless?
Wired.
>
> 2. Using NetworkManager or classic network config?
Network manager.
>
> 3. DHCP or fixed IPs?
Fixed IP.
>
> 4. Does anything weird show up in the output of dmesg or in any of the
> log files (e.g. /var/log/messages, etc.)?
No, but I am searching for it. The motherboard has a Z77 chipset.

I see some errors like:

DMA: Out of SW-IOMMU space for 32768 bytes at device 0000:05:00.0

I don't know the device though.

George