[CentOS] Jumbo frames problem with Realtek NICs?

On 06/23/2011 10:20 AM, Emmanuel Noobadmin wrote:
> I assumed 4K would still be better than nothing but unfortunately
> bumping up the MTU to anything else but 1.5K caused the file transfers
> (using NFS for easy testing), to hang at random points or more
> accurate slow to a crawl.

I don't know anything specifically about those cards, but you'll see 
that behavior on any card unless all of the hosts on a broadcast domain 
are using the same MTU.  You need to set all of the devices on a LAN 
segment, including the router, to the same MTU.