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| author | Paolo Abeni <pabeni@redhat.com> | 2023-03-30 13:40:04 +0200 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2023-03-30 13:40:04 +0200 |
| commit | 4ddd6375c3ef6756d492ea5466408cace097121b (patch) | |
| tree | 955e0aa2919e1b114b1727e7fddd538c73b3c205 /include | |
| parent | 7079d5e61aaa14cd04fd2fe7a8a2b6eca7833fdb (diff) | |
| parent | 8b43fd3d1d7d88293eb15e92090826e6b7cc13e4 (diff) | |
Merge branch 'net-rps-rfs-improvements'
Eric Dumazet says:
====================
net: rps/rfs improvements
Jason Xing attempted to optimize napi_schedule_rps() by avoiding
unneeded NET_RX_SOFTIRQ raises: [1], [2]
This is quite complex to implement properly. I chose to implement
the idea, and added a similar optimization in ____napi_schedule()
Overall, in an intensive RPC workload, with 32 TX/RX queues with RFS
I was able to observe a ~10% reduction of NET_RX_SOFTIRQ
invocations.
While this had no impact on throughput or cpu costs on this synthetic
benchmark, we know that firing NET_RX_SOFTIRQ from softirq handler
can force __do_softirq() to wakeup ksoftirqd when need_resched() is true.
This can have a latency impact on stressed hosts.
[1] https://lore.kernel.org/lkml/20230325152417.5403-1-kerneljasonxing@gmail.com/
[2] https://lore.kernel.org/netdev/20230328142112.12493-1-kerneljasonxing@gmail.com/
====================
Link: https://lore.kernel.org/r/20230328235021.1048163-1-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netdevice.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 18a5be6ddd0f..c8c634091a65 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3188,6 +3188,7 @@ struct softnet_data { #ifdef CONFIG_RPS struct softnet_data *rps_ipi_list; #endif + bool in_net_rx_action; #ifdef CONFIG_NET_FLOW_LIMIT struct sd_flow_limit __rcu *flow_limit; #endif |