[$] Smarter IRQ suspension in the networking stack

High-performance networking is a highly tuned activity; the amount of time
available to deal with each packet may be measured in nanoseconds, so care
must be taken to avoid anything that might slow the process down.
Recently, there has been a fair amount of attention given to a patch set
merged for 6.13 that, it is claimed, can improve processing efficiency
(and, thus, power savings)
in data centers by as much as 30%. The change itself, contributed by Joe
Damato and Martin Karsten, is a relatively small tweak to existing
optimization techniques; it shows just how much care is needed to optimize
a high-bandwidth server.