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d649a7a81f
linux_dsm_epyc7002/net
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Eric Dumazet d649a7a81f tcp: limit GSO packets to half cwnd 
In DC world, GSO packets initially cooked by tcp_sendmsg() are usually
big, as sk_pacing_rate is high.

When network is congested, cwnd can be smaller than the GSO packets
found in socket write queue. tcp_write_xmit() splits GSO packets
using the available cwnd, and we end up sending a single GSO packet,
consuming all available cwnd.

With GRO aggregation on the receiver, we might handle a single GRO
packet, sending back a single ACK.

1) This single ACK might be lost
   TLP or RTO are forced to attempt a retransmit.
2) This ACK releases a full cwnd, sender sends another big GSO packet,
   in a ping pong mode.

This behavior does not fill the pipes in the best way, because of
scheduling artifacts.

Make sure we always have at least two GSO packets in flight.

This allows us to safely increase GRO efficiency without risking
spurious retransmits.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-11-13 15:21:44 -05:00
..
6lowpan ieee802154: 6lowpan: rename process_data and lowpan_process_data 2014-10-27 15:51:16 +01:00
9p 9p/trans_virtio: enable VQs early 2014-10-15 10:25:04 +10:30
802 net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
8021q net: better IFF_XMIT_DST_RELEASE support 2014-10-07 13:22:11 -04:00
appletalk net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
atm net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
ax25 net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
batman-adv batman-adv: replace strnicmp with strncasecmp 2014-10-14 02:18:24 +02:00
bluetooth Merge tag 'master-2014-11-04' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next 2014-11-10 14:34:59 -05:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-11-06 22:01:18 -05:00
caif net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
can can: add hash based access to single EFF frame filters 2014-05-19 09:38:24 +02:00
ceph Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2014-10-15 06:46:01 +02:00
core net: generic dev_disable_lro() stacked device handling 2014-11-13 14:48:56 -05:00
dcb dcbnl : Fix misleading dcb_app->priority explanation 2014-07-30 17:21:05 -07:00
dccp dccp: Convert DCCP_WARN to net_warn_ratelimited 2014-11-08 21:22:54 -05:00
decnet neigh: remove dynamic neigh table registration support 2014-11-11 15:23:54 -05:00
dns_resolver Merge commit 'v3.16' into next 2014-10-01 00:44:04 +10:00
dsa dsa: Use netdev_<level> instead of printk 2014-11-11 13:30:57 -05:00
ethernet net: Add function for parsing the header length out of linear ethernet frames 2014-09-05 17:47:02 -07:00
hsr net/hsr: Remove left-over never-true conditional code. 2014-07-11 15:04:40 -07:00
ieee802154 Merge tag 'master-2014-11-04' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next 2014-11-10 14:34:59 -05:00
ipv4 tcp: limit GSO packets to half cwnd 2014-11-13 15:21:44 -05:00
ipv6 neigh: remove dynamic neigh table registration support 2014-11-11 15:23:54 -05:00
ipx net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
irda irda: Fix build failures after IRDA_DEBUG->pr_debug 2014-11-12 22:01:14 -05:00
iucv net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
key net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
l2tp net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
lapb lapb: move EXPORT_SYMBOL after functions. 2014-10-24 15:51:42 -04:00
llc net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
mac80211 mac80211: replace restart_complete() with reconfig_complete() 2014-11-04 13:49:00 +01:00
mac802154 mac802154: add basic support for monitor 2014-10-29 23:07:46 +01:00
mpls net: Remove MPLS GSO feature. 2014-11-05 23:52:33 -08:00
netfilter rhashtable: Drop gfp_flags arg in insert/remove functions 2014-11-13 15:18:40 -05:00
netlabel netlabel: kernel-doc warning fix 2014-10-09 01:40:05 -04:00
netlink rhashtable: Drop gfp_flags arg in insert/remove functions 2014-11-13 15:18:40 -05:00
netrom net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
nfc net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
openvswitch openvswitch: Add support for OVS_FLOW_ATTR_PROBE. 2014-11-09 18:58:44 -08:00
packet net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
phonet net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited 2014-11-11 14:10:31 -05:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-10-18 09:31:37 -07:00
rfkill net: rfkill: kernel-doc warning fixes 2014-10-09 11:16:15 +02:00
rose net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
rxrpc net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
sched sched: fix act file names in header comment 2014-11-06 15:04:41 -05:00
sctp net: introduce SO_INCOMING_CPU 2014-11-11 13:00:06 -05:00
sunrpc Merge branch 'for-3.18' of git://linux-nfs.org/~bfields/linux 2014-10-08 12:51:44 -04:00
tipc net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
unix net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
vmw_vsock net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
wimax wimax: convert printk to pr_foo() 2014-10-07 20:28:44 -04:00
wireless This relatively large batch of changes is comprised of the 2014-11-04 16:18:12 -05:00
x25 net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
xfrm net: skb_fclone_busy() needs to detect orphaned skb 2014-10-30 19:58:30 -04:00
compat.c net: sendmsg: fix NULL pointer dereference 2014-07-29 12:20:22 -07:00
Kconfig bpf: split eBPF out of NET 2014-10-27 19:09:59 -04:00
Makefile 6lowpan: introduce new net/6lowpan directory 2014-07-12 01:53:30 +02:00
nonet.c
socket.c File locking related changes for v3.18 (pile #1) 2014-10-11 13:21:34 -04:00
sysctl_net.c