search for: _replacement_

...ely in the cache (with the P4 being an outlier, and all locked instructions tend to take ~100+ cycles, but I can't say I can really find it in myself to even care about netburst any more). The most noticeable downside we've seen has been when we've used "read-op-cmpxchg" as a _replacement_ for something like "lock [x]add", when that "read+cmpxchg" has caused two cacheline ops (cacheline first loaded shared by the read, then exclusive by the cmpxchg). That's bad. But if preceded by a write (or, in this case, an xadd), that doesn't happen. Still, those roug...

...ely in the cache (with the P4 being an outlier, and all locked instructions tend to take ~100+ cycles, but I can't say I can really find it in myself to even care about netburst any more). The most noticeable downside we've seen has been when we've used "read-op-cmpxchg" as a _replacement_ for something like "lock [x]add", when that "read+cmpxchg" has caused two cacheline ops (cacheline first loaded shared by the read, then exclusive by the cmpxchg). That's bad. But if preceded by a write (or, in this case, an xadd), that doesn't happen. Still, those roug...

In virtualized environment there are mainly three problems related to spinlocks that affect performance. 1. LHP (lock holder preemption) 2. Lock Waiter Preemption (LWP) 3. Starvation/fairness Though ticketlocks solve the fairness problem, it worsens LWP, LHP problems. pv-ticketlocks tried to address this. But we can further improve at the cost of relaxed fairness. In this patch, we form a batch

In virtualized environment there are mainly three problems related to spinlocks that affect performance. 1. LHP (lock holder preemption) 2. Lock Waiter Preemption (LWP) 3. Starvation/fairness Though ticketlocks solve the fairness problem, it worsens LWP, LHP problems. pv-ticketlocks tried to address this. But we can further improve at the cost of relaxed fairness. In this patch, we form a batch