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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Jeremy Chadwick <koitsu@freebsd.org>
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Cc: PYUN Yong-Hyeon <pyunyh@gmail.com>, Aniruddha <mailing_list@orange.nl>,
	freebsd-questions@freebsd.org
Subject: Re: Under heavy load internet gets killed, only a reboot can bring
 it back up
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>
> One thing worth trying would be to disable MSI/MSI-X.  You can disable
> these by adding the following to your /boot/loader.conf :
>
> hw.pci.enable_msix="0"
> hw.pci.enable_msi="0"

what's wrong in MSI interrupts?

>> mskc0: Uncorrectable PCI Express error
>> mskc0: Uncorrectable PCI Express error
>
> Those errors at the end of your dmesg don't look good; could be the sign
> of a NIC or motherboard that's going bad, or possibly a very strange
> driver problem.

or just connectors should be cleaner or card isn't fitted well - contact 
problems.