linux_dsm_epyc7002/net
Chuck Lever e7104a2a96 xprtrdma: Cap req_cqinit
Recent work made FRMR registration and invalidation completions
unsignaled. This greatly reduces the adapter interrupt rate.

Every so often, however, a posted send Work Request is allowed to
signal. Otherwise, the provider's Work Queue will wrap and the
workload will hang.

The number of Work Requests that are allowed to remain unsignaled is
determined by the value of req_cqinit. Currently, this is set to the
size of the send Work Queue divided by two, minus 1.

For FRMR, the send Work Queue is the maximum number of concurrent
RPCs (currently 32) times the maximum number of Work Requests an
RPC might use (currently 7, though some adapters may need more).

For mlx4, this is 224 entries. This leaves completion signaling
disabled for 111 send Work Requests.

Some providers hold back dispatching Work Requests until a CQE is
generated.  If completions are disabled, then no CQEs are generated
for quite some time, and that can stall the Work Queue.

I've seen this occur running xfstests generic/113 over NFSv4, where
eventually, posting a FAST_REG_MR Work Request fails with -ENOMEM
because the Work Queue has overflowed. The connection is dropped
and re-established.

Cap the rep_cqinit setting so completions are not left turned off
for too long.

BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=269
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2014-11-25 13:39:20 -05:00
..
6lowpan 6lowpan: Allow 6LoWPAN to be modular 2014-08-07 11:44:18 -07:00
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 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-07-16 14:09:34 -07:00
atm net: better IFF_XMIT_DST_RELEASE support 2014-10-07 13:22:11 -04:00
ax25 net: Fix use after free by removing length arg from sk_data_ready callbacks. 2014-04-11 16:15:36 -04:00
batman-adv batman-adv: replace strnicmp with strncasecmp 2014-10-14 02:18:24 +02:00
bluetooth Bluetooth: 6lowpan: Check transmit errors for multicast packets 2014-10-02 13:41:57 +03:00
bridge bridge: fix netfilter/NF_BR_LOCAL_OUT for own, locally generated queries 2014-11-17 12:38:02 +01:00
caif caif_usb: use target structure member in memset 2014-10-14 16:05:45 -04:00
can can: add hash based access to single EFF frame filters 2014-05-19 09:38:24 +02:00
ceph libceph: change from BUG to WARN for __remove_osd() asserts 2014-11-13 22:26:34 +03:00
core net: Revert "net: avoid one atomic operation in skb_clone()" 2014-11-21 15:26:32 -05:00
dcb dcbnl : Disable software interrupts before taking dcb_lock 2014-11-16 14:50:52 -05:00
dccp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-10-18 09:31:37 -07:00
decnet af_decnet: Use time_after_eq 2014-08-22 12:23:11 -07:00
dns_resolver Merge commit 'v3.16' into next 2014-10-01 00:44:04 +10:00
dsa net: dsa: slave: Fix autoneg for phys on switch MDIO bus 2014-11-06 15:06:28 -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-2014-10-02' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next 2014-10-05 21:34:39 -04:00
ipv4 tcp: Restore RFC5961-compliant behavior for SYN packets 2014-11-21 15:33:50 -05:00
ipv6 ipv6: delete protocol and unregister rtnetlink when cleanup 2014-11-19 16:56:17 -05:00
ipx ipx: fix locking regression in ipx_sendmsg and ipx_recvmsg 2014-11-20 22:57:03 -05:00
irda irda: stop calling sk_prot->disconnect() on connection failure 2014-11-02 10:20:26 -08:00
iucv iucv: Convert pr_warning to pr_warn 2014-09-10 12:40:10 -07:00
key af_key: remove unnecessary break after return 2014-07-15 16:27:00 -07:00
l2tp l2tp: Refactor l2tp core driver to make use of the common UDP tunnel functions 2014-09-19 15:57:15 -04:00
lapb
llc net_dma: simple removal 2014-09-28 07:05:16 -07:00
mac80211 mac80211: minstrel_ht: fix a crash in rate sorting 2014-11-18 22:39:16 +01:00
mac802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-10-08 21:40:54 -04:00
mpls mpls: Allow mpls_gso to be built as module 2014-10-31 15:47:21 -04:00
netfilter netfilter: nfnetlink: fix insufficient validation in nfnetlink_bind 2014-11-17 12:01:13 +01:00
netlabel netlabel: kernel-doc warning fix 2014-10-09 01:40:05 -04:00
netlink netlink: Properly unbind in error conditions. 2014-11-12 15:12:06 -05:00
netrom netrom: use linux/uaccess.h 2014-10-17 23:52:54 -04:00
nfc NFC: nci: Add support for proprietary RF Protocols 2014-09-24 02:02:24 +02:00
openvswitch openvswitch: Don't validate IPv6 label masks. 2014-11-20 22:56:13 -05:00
packet net: Pass a "more" indication down into netdev_start_xmit() code paths. 2014-09-01 17:39:55 -07:00
phonet net: fix rcu access on phonet_routes 2014-10-06 18:16:30 -04:00
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 rose: use %*ph specifier 2014-09-07 16:07:25 -07:00
rxrpc Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2014-10-12 10:13:55 -04:00
sched sch_pie: schedule the timer after all init succeed 2014-10-29 14:28:01 -04:00
sctp net: sctp: fix memory leak in auth key management 2014-11-11 15:19:11 -05:00
sunrpc xprtrdma: Cap req_cqinit 2014-11-25 13:39:20 -05:00
tipc tipc: fix lockdep warning when intra-node messages are delivered 2014-10-21 15:28:15 -04:00
unix af_unix: remove 0 assignment on static 2014-10-07 17:03:14 -04:00
vmw_vsock vsock: Make transport the proto owner 2014-05-05 13:13:50 -04:00
wimax wimax: convert printk to pr_foo() 2014-10-07 20:28:44 -04:00
wireless Here are a few fixes for the wireless stack: one fixes the 2014-10-27 13:38:15 -04:00
x25 net: Fix use after free by removing length arg from sk_data_ready callbacks. 2014-04-11 16:15:36 -04:00
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