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net: revert default NAPI poll timeout to 2 jiffies

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For HZ < 1000 timeout 2000us rounds up to 1 jiffy but expires randomly
because next timer interrupt could come shortly after starting softirq.

For commonly used CONFIG_HZ=1000 nothing changes.

Fixes: 7acf8a1e8a ("Replace 2 jiffies with sysctl netdev_budget_usecs to enable softirq tuning")
Reported-by: Dmitry Yakunin <zeil@yandex-team.ru>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Konstantin Khlebnikov 2020-04-06 14:39:32 +03:00 committed by David S. Miller
parent a5d7553829
commit a4837980fd
1 changed files with 2 additions and 1 deletions
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net/core/dev.c
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@ -4140,7 +4140,8 @@ EXPORT_SYMBOL(netdev_max_backlog);
int netdev_tstamp_prequeue __read_mostly = 1; int netdev_tstamp_prequeue __read_mostly = 1;
int netdev_budget __read_mostly = 300; int netdev_budget __read_mostly = 300;
unsigned int __read_mostly netdev_budget_usecs = 2000; /* Must be at least 2 jiffes to guarantee 1 jiffy timeout */
unsigned int __read_mostly netdev_budget_usecs = 2 * USEC_PER_SEC / HZ;
int weight_p __read_mostly = 64; /* old backlog weight */ int weight_p __read_mostly = 64; /* old backlog weight */
int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */ int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */
int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */ int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */