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net: move dev_tx_weight to net_hotdata

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dev_tx_weight is used in tx fast path.

Move it to 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/20240306160031.874438-9-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2024-03-06 16:00:21 +00:00 committed by Jakub Kicinski
parent 0139806eeb
commit 26722dc74b
6 changed files with 5 additions and 4 deletions
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1
include/linux/netdevice.h
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@ -4794,7 +4794,6 @@ void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s,
void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s);
extern int dev_rx_weight;
extern int dev_tx_weight;
enum {
NESTED_SYNC_IMM_BIT,

1
include/net/hotdata.h
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@ -21,6 +21,7 @@ struct net_hotdata {
int netdev_budget_usecs;
int tstamp_prequeue;
int max_backlog;
int dev_tx_weight;
};
extern struct net_hotdata net_hotdata;

1
net/core/dev.c
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@ -4409,7 +4409,6 @@ 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 */
int dev_rx_weight __read_mostly = 64;
int dev_tx_weight __read_mostly = 64;
/* Called with irq disabled */
static inline void ____napi_schedule(struct softnet_data *sd,

1
net/core/hotdata.c
View File

@ -16,5 +16,6 @@ struct net_hotdata net_hotdata __cacheline_aligned = {
.tstamp_prequeue = 1,
.max_backlog = 1000,
.dev_tx_weight = 64,
};
EXPORT_SYMBOL(net_hotdata);

2
net/core/sysctl_net_core.c
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@ -302,7 +302,7 @@ static int proc_do_dev_weight(struct ctl_table *table, int write,
if (!ret && write) {
weight = READ_ONCE(weight_p);
WRITE_ONCE(dev_rx_weight, weight * dev_weight_rx_bias);
WRITE_ONCE(dev_tx_weight, weight * dev_weight_tx_bias);
WRITE_ONCE(net_hotdata.dev_tx_weight, weight * dev_weight_tx_bias);
}
mutex_unlock(&dev_weight_mutex);

3
net/sched/sch_generic.c
View File

@ -27,6 +27,7 @@
#include <net/sch_generic.h>
#include <net/pkt_sched.h>
#include <net/dst.h>
#include <net/hotdata.h>
#include <trace/events/qdisc.h>
#include <trace/events/net.h>
#include <net/xfrm.h>
@ -409,7 +410,7 @@ static inline bool qdisc_restart(struct Qdisc *q, int *packets)
void __qdisc_run(struct Qdisc *q)
{
int quota = READ_ONCE(dev_tx_weight);
int quota = READ_ONCE(net_hotdata.dev_tx_weight);
int packets;
while (qdisc_restart(q, &packets)) {