Replace 2 jiffies with sysctl netdev_budget_usecs to enable softirq tuning

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Constants used for tuning are generally a bad idea, especially as hardware
changes over time. Replace the constant 2 jiffies with sysctl variable
netdev_budget_usecs to enable sysadmins to tune the softirq processing.
Also document the variable.

For example, a very fast machine might tune this to 1000 microseconds,
while my regression testing 486DX-25 needs it to be 4000 microseconds on
a nearly idle network to prevent time_squeeze from being incremented.

Version 2: changed jiffies to microseconds for predictable units.

Signed-off-by: Matthew Whitehead <tedheadster@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Matthew Whitehead 2017-04-19 12:37:10 -04:00 • committed by David S. Miller

parent 20da848f8e

commit 7acf8a1e8a

6 changed files with 24 additions and 2 deletions

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1

include/linux/netdevice.h

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1

include/uapi/linux/sysctl.h

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