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Commit 24f8b238 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
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net: increase receive packet quantum 



This patch gets about 1.25% back on tbench regression.

My change to NAPI for multiqueue support changed the time limit on
network receive processing.  Under sustained loads like tbench, this
can cause the receiver to reschedule prematurely. 

Signed-off-by: default avatarStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b9ac9985

net/core/dev.c

+4 −7
Original line number Diff line number Diff line
@@ -2373,7 +2373,7 @@ EXPORT_SYMBOL(__napi_schedule); 
static void net_rx_action(struct softirq_action *h)

{

	struct list_head *list = &__get_cpu_var(softnet_data).poll_list;

	unsigned long start_time = jiffies;

	unsigned long time_limit = jiffies + 2;

	int budget = netdev_budget;

	void *have;
@@ -2384,13 +2384,10 @@ static void net_rx_action(struct softirq_action *h) 
		int work, weight;



		/* If softirq window is exhuasted then punt.

		 *

		 * Note that this is a slight policy change from the

		 * previous NAPI code, which would allow up to 2

		 * jiffies to pass before breaking out.  The test

		 * used to be "jiffies - start_time > 1".

		 * Allow this to run for 2 jiffies since which will allow

		 * an average latency of 1.5/HZ.

		 */

		if (unlikely(budget <= 0 || jiffies != start_time))

		if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))

			goto softnet_break;



		local_irq_enable();