AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/net/ipv4
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Eric Dumazet 54287cc178 [TCP]: Keep copied_seq, rcv_wup and rcv_next together. 
I noticed in oprofile study a cache miss in tcp_rcv_established() to read
copied_seq.

ffffffff80400a80 <tcp_rcv_established>: /* tcp_rcv_established total: 4034293  
2.0400 */

 55493  0.0281 :ffffffff80400bc9:   mov    0x4c8(%r12),%eax copied_seq
543103  0.2746 :ffffffff80400bd1:   cmp    0x3e0(%r12),%eax   rcv_nxt    

if (tp->copied_seq == tp->rcv_nxt &&
        len - tcp_header_len <= tp->ucopy.len) {

In this function, the cache line 0x4c0 -> 0x500 is used only for this
reading 'copied_seq' field.

rcv_wup and copied_seq should be next to rcv_nxt field, to lower number of
active cache lines in hot paths. (tcp_rcv_established(), tcp_poll(), ...)

As you suggested, I changed tcp_create_openreq_child() so that these fields
are changed together, to avoid adding a new store buffer stall.

Patch is 64bit friendly (no new hole because of alignment constraints)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25 22:23:21 -07:00
..
ipvs [PATCH] sysctl: remove insert_at_head from register_sysctl 2007-02-14 08:09:59 -08:00
netfilter [NETFILTER] arp_tables: Fix unaligned accesses. 2007-04-13 16:37:54 -07:00
af_inet.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
ah4.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
arp.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
cipso_ipv4.c [NetLabel]: parse the CIPSO ranged tag on incoming packets 2007-03-12 14:38:02 -07:00
datagram.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
devinet.c [IPV4]: Fix rtm_to_ifaddr() error handling. 2007-03-09 13:43:24 -08:00
esp4.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
fib_frontend.c [NETLINK]: Infinite recursion in netlink. 2007-04-25 13:07:28 -07:00
fib_hash.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
fib_lookup.h [IPV4]: net/ipv4/fib annotations 2006-09-28 18:02:23 -07:00
fib_rules.c [NET]: Fix fib_rules compatibility breakage 2007-03-25 18:48:00 -07:00
fib_semantics.c [IPv4] fib: Fix out of bound access of fib_props[] 2007-03-25 18:48:03 -07:00
fib_trie.c [IPV4] fib_trie: Document locking. 2007-03-26 14:22:22 -07:00
icmp.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
igmp.c [IPV4]: Fix warning in ip_mc_rejoin_group. 2007-03-12 17:02:37 -07:00
inet_connection_sock.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
inet_diag.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
inet_hashtables.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
inet_timewait_sock.c [NET]: change layout of ehash table 2007-02-08 14:16:46 -08:00
inetpeer.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
ip_forward.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
ip_fragment.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
ip_gre.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
ip_input.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
ip_options.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
ip_output.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
ip_sockglue.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
ipcomp.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
ipconfig.c [PATCH] mark struct file_operations const 7 2007-02-12 09:48:46 -08:00
ipip.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
ipmr.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
Kconfig [TCP] YeAH-TCP: algorithm implementation 2007-04-25 22:23:18 -07:00
Makefile [TCP] YeAH-TCP: algorithm implementation 2007-04-25 22:23:18 -07:00
multipath_drr.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
multipath_random.c [IPV4]: Use random32() in net/ipv4/multipath 2007-02-26 11:43:00 -08:00
multipath_rr.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
multipath_wrandom.c [IPV4]: Use random32() in net/ipv4/multipath 2007-02-26 11:43:00 -08:00
multipath.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
netfilter.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
proc.c [PATCH] mark struct file_operations const 7 2007-02-12 09:48:46 -08:00
protocol.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
raw.c [PATCH] mark struct file_operations const 7 2007-02-12 09:48:46 -08:00
route.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
syncookies.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
sysctl_net_ipv4.c [TCP]: Add RFC3742 Limited Slow-Start, controlled by variable sysctl_tcp_max_ssthresh. 2007-04-25 22:23:19 -07:00
tcp_bic.c [TCP] tcp_bic: use BUILD_BUG_ON 2006-09-22 15:18:04 -07:00
tcp_cong.c [TCP]: Add RFC3742 Limited Slow-Start, controlled by variable sysctl_tcp_max_ssthresh. 2007-04-25 22:23:19 -07:00
tcp_cubic.c [TCP]: Use read mostly for CUBIC parameters. 2007-02-12 13:15:20 -08:00
tcp_diag.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
tcp_highspeed.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
tcp_htcp.c [TCP]: cleanup of htcp (resend) 2007-02-12 13:34:03 -08:00
tcp_hybla.c [TCP] Congestion control (modulo lp, bic): use BUILD_BUG_ON 2006-09-22 15:18:13 -07:00
tcp_input.c [TCP]: SACK enhanced FRTO 2007-04-25 22:23:16 -07:00
tcp_ipv4.c [TCP]: struct *sock argument renamed: sp -> sk 2007-04-25 22:23:20 -07:00
tcp_lp.c [TCP] tcp-lp: prevent chance for oops 2006-09-28 18:03:07 -07:00
tcp_minisocks.c [TCP]: Keep copied_seq, rcv_wup and rcv_next together. 2007-04-25 22:23:21 -07:00
tcp_output.c [TCP]: slow_start_after_idle should influence cwnd validation too 2007-04-09 13:31:15 -07:00
tcp_probe.c [PATCH] mark struct file_operations const 7 2007-02-12 09:48:46 -08:00
tcp_scalable.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
tcp_timer.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
tcp_vegas.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
tcp_veno.c [TCP] Congestion control (modulo lp, bic): use BUILD_BUG_ON 2006-09-22 15:18:13 -07:00
tcp_westwood.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
tcp_yeah.c [TCP] YeAH-TCP: algorithm implementation 2007-04-25 22:23:18 -07:00
tcp_yeah.h [TCP] YeAH-TCP: algorithm implementation 2007-04-25 22:23:18 -07:00
tcp.c [TCP]: Fix tcp_mem[] initialization. 2007-03-16 15:04:03 -07:00
tunnel4.c [IPSEC]: Changing API of xfrm4_tunnel_register. 2007-02-13 12:54:47 -08:00
udp_impl.h [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
udp.c [UDP]: Reread uh pointer after pskb_trim 2007-03-07 16:08:04 -08:00
udplite.c [NET]: Possible cleanups. 2006-12-02 21:31:51 -08:00
xfrm4_input.c [IPSEC]: Changing API of xfrm4_tunnel_register. 2007-02-13 12:54:47 -08:00
xfrm4_mode_beet.c [XFRM]: beet: fix pseudo header length value 2007-04-23 22:39:02 -07:00
xfrm4_mode_transport.c [IPSEC]: output mode to take an xfrm state as input param 2006-09-22 15:18:48 -07:00
xfrm4_mode_tunnel.c [XFRM_TUNNEL]: Reload header pointer after pskb_may_pull/pskb_expand_head 2007-02-26 11:43:01 -08:00
xfrm4_output.c [NET] IPV4: Fix whitespace errors. 2007-02-10 23:19:39 -08:00
xfrm4_policy.c [XFRM]: Fix oops in xfrm4_dst_destroy() 2007-02-26 12:10:32 -08:00
xfrm4_state.c [IPSEC]: exporting xfrm_state_afinfo 2007-02-08 12:39:00 -08:00
xfrm4_tunnel.c [IPSEC]: Changing API of xfrm4_tunnel_register. 2007-02-13 12:54:47 -08:00