Messages in this thread | | | Subject | Re: [PATCH v2 net-next] softirq: reduce latencies | From | Joe Perches <> | Date | Fri, 04 Jan 2013 00:15:51 -0800 |
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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.
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