Re: Upgrade to gigabyte NIC?

From: Susan Bradley, CPA aka Ebitz - SBS Rocks [MVP] (
Date: 02/21/05

Date: Sun, 20 Feb 2022 19:39:46 -0800

When I've changed a physical NIC [especially the inner one] you have to
do the "loopback" install so that the inner NIC gunk stays with the
server [does that make sense?]

Henry Craven [SBS-MVP] wrote:
> Disable it prior, or the system will complain that you have the same IP
> Assigned twice. to different devices.
> I'd be interested to hear if you get the performance gain you expect.
> and whether it's a value ROI.
> Just an FYI ------
> Fast Ethernet based communication systems behave poorly when sending and
> receiving small packets of data. When using small packets,a temporal
> bottleneck occurs in the communication, causing low throughputs. By
> eliminating some of the possible causes for the bottleneck we were able
> to focus on the CPU as the main hardware reason for it, as the tests
> showed very high and increasing CPU loads when using decreasing size
> packets. By thoroughly testing the possible reasons for that CPU load,
> we came to a conclusion that the main cause of the bottleneck is the
> well known Interrupt Livelock situation, where mass of incoming packets
> cause a very large number of NIC interrupts to the CPU, causing the CPU
> to use almost all of its resources for dealing with the interrupts and
> doing hardly anything else. As the NICs hardware improves and