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net: move netdev_budget and netdev_budget to net_hotdata

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netdev_budget and netdev_budget are used in rx path (net_rx_action())

Move them into net_hotdata for better cache locality.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20240306160031.874438-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2024-03-06 16:00:15 +00:00 committed by Jakub Kicinski
parent 2658b5a8a4
commit ae6e22f7b7
5 changed files with 12 additions and 9 deletions
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2
include/net/hotdata.h
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@ -8,6 +8,8 @@
struct net_hotdata {
struct list_head offload_base;
int gro_normal_batch;
int netdev_budget;
int netdev_budget_usecs;
};
extern struct net_hotdata net_hotdata;

7
net/core/dev.c
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@ -4410,9 +4410,6 @@ EXPORT_SYMBOL(netdev_max_backlog);
int netdev_tstamp_prequeue __read_mostly = 1;
unsigned int sysctl_skb_defer_max __read_mostly = 64;
int netdev_budget __read_mostly = 300;
/* 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 */
@ -6790,8 +6787,8 @@ static __latent_entropy void net_rx_action(struct softirq_action *h)
{
struct softnet_data *sd = this_cpu_ptr(&softnet_data);
unsigned long time_limit = jiffies +
usecs_to_jiffies(READ_ONCE(netdev_budget_usecs));
int budget = READ_ONCE(netdev_budget);
usecs_to_jiffies(READ_ONCE(net_hotdata.netdev_budget_usecs));
int budget = READ_ONCE(net_hotdata.netdev_budget);
LIST_HEAD(list);
LIST_HEAD(repoll);

2
net/core/dev.h
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@ -38,8 +38,6 @@ int dev_addr_init(struct net_device *dev);
void dev_addr_check(struct net_device *dev);
/* sysctls not referred to from outside net/core/ */
extern int netdev_budget;
extern unsigned int netdev_budget_usecs;
extern unsigned int sysctl_skb_defer_max;
extern int netdev_tstamp_prequeue;
extern int netdev_unregister_timeout_secs;

6
net/core/hotdata.c
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@ -1,9 +1,15 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <net/hotdata.h>
#include <linux/cache.h>
#include <linux/jiffies.h>
#include <linux/list.h>
struct net_hotdata net_hotdata __cacheline_aligned = {
.offload_base = LIST_HEAD_INIT(net_hotdata.offload_base),
.gro_normal_batch = 8,
.netdev_budget = 300,
/* Must be at least 2 jiffes to guarantee 1 jiffy timeout */
.netdev_budget_usecs = 2 * USEC_PER_SEC / HZ,
};

4
net/core/sysctl_net_core.c
View File

@ -577,7 +577,7 @@ static struct ctl_table net_core_table[] = {
#endif
{
.procname = "netdev_budget",
.data = &netdev_budget,
.data = &net_hotdata.netdev_budget,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
@ -600,7 +600,7 @@ static struct ctl_table net_core_table[] = {
},
{
.procname = "netdev_budget_usecs",
.data = &netdev_budget_usecs,
.data = &net_hotdata.netdev_budget_usecs,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,