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net: don't set sw irq coalescing defaults in case of PREEMPT_RT

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If PREEMPT_RT is set, then assume that the user focuses on minimum
latency. Therefore don't set sw irq coalescing defaults.
This affects the defaults only, users can override these settings
via sysfs.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/f9439c7f-c92c-4c2c-703e-110f96d841b7@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Heiner Kallweit 2023-05-28 19:39:59 +02:00 committed by Jakub Kicinski
parent 60cbd38bb0
commit 748b442800
1 changed files with 4 additions and 2 deletions
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6
net/core/dev.c
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@ -10571,8 +10571,10 @@ void netdev_sw_irq_coalesce_default_on(struct net_device *dev)
{
WARN_ON(dev->reg_state == NETREG_REGISTERED);
dev->gro_flush_timeout = 20000;
dev->napi_defer_hard_irqs = 1;
if (!IS_ENABLED(CONFIG_PREEMPT_RT)) {
dev->gro_flush_timeout = 20000;
dev->napi_defer_hard_irqs = 1;
}
}
EXPORT_SYMBOL_GPL(netdev_sw_irq_coalesce_default_on);