On Thu, Sep 01, 2016 at 02:58:13PM -0700, Greg wrote: > On Thu, 2016-09-01 at 22:14 +0200, Pavel Machek wrote: > > Hi! > > > > I have trouble getting 1000mbit out of my ethernet card. > > > > I tried direct connection between two PCs with different cables, and > > no luck. > > > > Today I tried connection to 1000mbit switch, and no luck, either. (Two > > cables, one was cat6, both short). > > > > My computer sees 1000mbit being advertised by the other side, but does > > not advertise 1000mbit, "Link Speed was downgraded by SmartSpeed". > > Check your cables? > > https://vmxp.wordpress.com/2015/01/06/1gbe-intel-nic-throttled-to-100mbit-by-smartspeed/
Of course if it isn't the cable, then it could even be a broken pin in the port. As far as I can tell, anything that causes one of the 3rd or 4th pairs of wires to not work will degrade to 100Mbit on just the first 2 pairs of wires and give that message. Some badly implemented switches can also cause it of course. -- Len Sorensen
