On Thu, 10 Jan 2019 at 01:07, Jim Mulder <[email protected]> wrote: > > The coordination with other CPUs is in getting exclusive control of > the storage operand cache line. CS and ST both have to do that, so they > would be similar in performance in that regard.
But CS and friends carry the perhaps quite high penalty of invoking a serialization operation both before and after. Unlike CS, the result from ST can presumably be delayed indefinitely before being actually updated in storage. Tony H.
