On Thu, 2013-01-03 at 23:49 -0800, Eric Dumazet wrote: > In various network workloads, __do_softirq() latencies can be up > to 20 ms if HZ=1000, and 200 ms if HZ=100. > This patch changes the fallback to ksoftirqd condition to : > - A time limit of 2 ms.
[] > diff --git a/kernel/softirq.c b/kernel/softirq.c [] > +#define MAX_SOFTIRQ_TIME max(1, (2*HZ/1000)) And if HZ is 10000? > asmlinkage void __do_softirq(void) > { [] > + unsigned long end = jiffies + MAX_SOFTIRQ_TIME; Perhaps MAX_SOFTIRQ_TIME should be #define MAX_SOFTIRQ_TIME msecs_to_jiffies(2) though it would be nicer if it were a compile time constant. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/