On 01/14/2015 12:12 PM, Marcelo Tosatti wrote: > The problem: > > On -RT, an emulated LAPIC timer instances has the following path: > > 1) hard interrupt > 2) ksoftirqd is scheduled > 3) ksoftirqd wakes up vcpu thread > 4) vcpu thread is scheduled > > This extra context switch introduces unnecessary latency in the > LAPIC path for a KVM guest. > This patch reduces the average latency in my tests from 14us to 11us. > > Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx> Acked-by: Rik van Riel <riel@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
