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.
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| @@ -274,6 +274,7 @@ enum · 273 unmodified lines | |||
| 274 | NET_CORE_AEVENT_ETIME=20, | 274 | NET_CORE_AEVENT_ETIME=20, |
| 275 | NET_CORE_AEVENT_RSEQTH=21, | 275 | NET_CORE_AEVENT_RSEQTH=21, |
| 276 | NET_CORE_WARNINGS=22, | 276 | NET_CORE_WARNINGS=22, |
| 277 | NET_CORE_BUDGET_USECS=23, | ||
| 277 | }; | 278 | }; |
| 278 | 279 | ||
| 279 | /* /proc/sys/net/ethernet */ | 280 | /* /proc/sys/net/ethernet */ |