mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-25 16:31:13 +00:00
b2ea46fe23
An overall throughput gain of 22 % for heavy TCP use over a single TX queue. Original patchset comment https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v4.13&id=3f4888adae7c1619b990d98a9b967536f71822b8 Signed-off-by: Pavel Kubelun <be.dissent@gmail.com>
158 lines
5.2 KiB
Diff
158 lines
5.2 KiB
Diff
From 9115e8cd2a0c6eaaa900c462721f12e1d45f326c Mon Sep 17 00:00:00 2001
|
|
From: Eric Dumazet <edumazet@google.com>
|
|
Date: Sat, 3 Dec 2016 11:14:56 -0800
|
|
Subject: [PATCH 07/10] net: reorganize struct sock for better data locality
|
|
|
|
Group fields used in TX path, and keep some cache lines mostly read
|
|
to permit sharing among cpus.
|
|
|
|
Gained two 4 bytes holes on 64bit arches.
|
|
|
|
Added a place holder for tcp tsq_flags, next to sk_wmem_alloc
|
|
to speed up tcp_wfree() in the following patch.
|
|
|
|
I have not added ____cacheline_aligned_in_smp, this might be done later.
|
|
I prefer doing this once inet and tcp/udp sockets reorg is also done.
|
|
|
|
Tested with both TCP and UDP.
|
|
|
|
UDP receiver performance under flood increased by ~20 % :
|
|
Accessing sk_filter/sk_wq/sk_napi_id no longer stalls because sk_drops
|
|
was moved away from a critical cache line, now mostly read and shared.
|
|
|
|
/* --- cacheline 4 boundary (256 bytes) --- */
|
|
unsigned int sk_napi_id; /* 0x100 0x4 */
|
|
int sk_rcvbuf; /* 0x104 0x4 */
|
|
struct sk_filter * sk_filter; /* 0x108 0x8 */
|
|
union {
|
|
struct socket_wq * sk_wq; /* 0x8 */
|
|
struct socket_wq * sk_wq_raw; /* 0x8 */
|
|
}; /* 0x110 0x8 */
|
|
struct xfrm_policy * sk_policy[2]; /* 0x118 0x10 */
|
|
struct dst_entry * sk_rx_dst; /* 0x128 0x8 */
|
|
struct dst_entry * sk_dst_cache; /* 0x130 0x8 */
|
|
atomic_t sk_omem_alloc; /* 0x138 0x4 */
|
|
int sk_sndbuf; /* 0x13c 0x4 */
|
|
/* --- cacheline 5 boundary (320 bytes) --- */
|
|
int sk_wmem_queued; /* 0x140 0x4 */
|
|
atomic_t sk_wmem_alloc; /* 0x144 0x4 */
|
|
long unsigned int sk_tsq_flags; /* 0x148 0x8 */
|
|
struct sk_buff * sk_send_head; /* 0x150 0x8 */
|
|
struct sk_buff_head sk_write_queue; /* 0x158 0x18 */
|
|
__s32 sk_peek_off; /* 0x170 0x4 */
|
|
int sk_write_pending; /* 0x174 0x4 */
|
|
long int sk_sndtimeo; /* 0x178 0x8 */
|
|
|
|
Signed-off-by: Eric Dumazet <edumazet@google.com>
|
|
Tested-by: Paolo Abeni <pabeni@redhat.com>
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
---
|
|
include/net/sock.h | 51 +++++++++++++++++++++++++++------------------------
|
|
1 file changed, 27 insertions(+), 24 deletions(-)
|
|
|
|
--- a/include/net/sock.h
|
|
+++ b/include/net/sock.h
|
|
@@ -343,6 +343,9 @@ struct sock {
|
|
#define sk_rxhash __sk_common.skc_rxhash
|
|
|
|
socket_lock_t sk_lock;
|
|
+ atomic_t sk_drops;
|
|
+ int sk_rcvlowat;
|
|
+ struct sk_buff_head sk_error_queue;
|
|
struct sk_buff_head sk_receive_queue;
|
|
/*
|
|
* The backlog queue is special, it is always used with
|
|
@@ -359,14 +362,13 @@ struct sock {
|
|
struct sk_buff *tail;
|
|
} sk_backlog;
|
|
#define sk_rmem_alloc sk_backlog.rmem_alloc
|
|
- int sk_forward_alloc;
|
|
|
|
- __u32 sk_txhash;
|
|
+ int sk_forward_alloc;
|
|
#ifdef CONFIG_NET_RX_BUSY_POLL
|
|
- unsigned int sk_napi_id;
|
|
unsigned int sk_ll_usec;
|
|
+ /* ===== mostly read cache line ===== */
|
|
+ unsigned int sk_napi_id;
|
|
#endif
|
|
- atomic_t sk_drops;
|
|
int sk_rcvbuf;
|
|
|
|
struct sk_filter __rcu *sk_filter;
|
|
@@ -379,11 +381,30 @@ struct sock {
|
|
#endif
|
|
struct dst_entry *sk_rx_dst;
|
|
struct dst_entry __rcu *sk_dst_cache;
|
|
- /* Note: 32bit hole on 64bit arches */
|
|
- atomic_t sk_wmem_alloc;
|
|
atomic_t sk_omem_alloc;
|
|
int sk_sndbuf;
|
|
+
|
|
+ /* ===== cache line for TX ===== */
|
|
+ int sk_wmem_queued;
|
|
+ atomic_t sk_wmem_alloc;
|
|
+ unsigned long sk_tsq_flags;
|
|
+ struct sk_buff *sk_send_head;
|
|
struct sk_buff_head sk_write_queue;
|
|
+ __s32 sk_peek_off;
|
|
+ int sk_write_pending;
|
|
+ long sk_sndtimeo;
|
|
+ struct timer_list sk_timer;
|
|
+ __u32 sk_priority;
|
|
+ __u32 sk_mark;
|
|
+ u32 sk_pacing_rate; /* bytes per second */
|
|
+ u32 sk_max_pacing_rate;
|
|
+ struct page_frag sk_frag;
|
|
+ netdev_features_t sk_route_caps;
|
|
+ netdev_features_t sk_route_nocaps;
|
|
+ int sk_gso_type;
|
|
+ unsigned int sk_gso_max_size;
|
|
+ gfp_t sk_allocation;
|
|
+ __u32 sk_txhash;
|
|
|
|
/*
|
|
* Because of non atomicity rules, all
|
|
@@ -399,41 +420,23 @@ struct sock {
|
|
#define SK_PROTOCOL_MAX U8_MAX
|
|
kmemcheck_bitfield_end(flags);
|
|
|
|
- int sk_wmem_queued;
|
|
- gfp_t sk_allocation;
|
|
- u32 sk_pacing_rate; /* bytes per second */
|
|
- u32 sk_max_pacing_rate;
|
|
- netdev_features_t sk_route_caps;
|
|
- netdev_features_t sk_route_nocaps;
|
|
- int sk_gso_type;
|
|
- unsigned int sk_gso_max_size;
|
|
u16 sk_gso_max_segs;
|
|
- int sk_rcvlowat;
|
|
unsigned long sk_lingertime;
|
|
- struct sk_buff_head sk_error_queue;
|
|
struct proto *sk_prot_creator;
|
|
rwlock_t sk_callback_lock;
|
|
int sk_err,
|
|
sk_err_soft;
|
|
u32 sk_ack_backlog;
|
|
u32 sk_max_ack_backlog;
|
|
- __u32 sk_priority;
|
|
- __u32 sk_mark;
|
|
struct pid *sk_peer_pid;
|
|
const struct cred *sk_peer_cred;
|
|
long sk_rcvtimeo;
|
|
- long sk_sndtimeo;
|
|
- struct timer_list sk_timer;
|
|
ktime_t sk_stamp;
|
|
u16 sk_tsflags;
|
|
u8 sk_shutdown;
|
|
u32 sk_tskey;
|
|
struct socket *sk_socket;
|
|
void *sk_user_data;
|
|
- struct page_frag sk_frag;
|
|
- struct sk_buff *sk_send_head;
|
|
- __s32 sk_peek_off;
|
|
- int sk_write_pending;
|
|
#ifdef CONFIG_SECURITY
|
|
void *sk_security;
|
|
#endif
|