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| author | Konstantin Khlebnikov <khlebnikov@yandex-team.ru> | 2020-04-06 14:39:32 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-21 10:03:04 +0300 |
| commit | f7379c0050d2bfb65e44b340f1d667254dcc3058 (patch) | |
| tree | f0982ca8d21ef5804b8690ae0272e12f15a8b803 /net | |
| parent | c08e523e1507824733f4d5670e1717b52b3d8255 (diff) | |
| download | linux-f7379c0050d2bfb65e44b340f1d667254dcc3058.tar.xz | |
net: revert default NAPI poll timeout to 2 jiffies
[ Upstream commit a4837980fd9fa4c70a821d11831698901baef56b ]
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: 7acf8a1e8a28 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dev.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 2f4d35101f4d..426635e188fc 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3934,7 +3934,8 @@ EXPORT_SYMBOL(netdev_max_backlog); int netdev_tstamp_prequeue __read_mostly = 1; 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 dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */ int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */ |