perf samples too long (2519 > 2500), lowering kernel.perf_event_max_sample_rate to 50000

[phukariflux]

This message appears in dmesg after a while every time system is booted up.

"perf samples too long (2519 > 2500), lowering kernel.perf_event_max_sample_rate to 50000"

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-12-generic 3.11.0-12.19
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: karlflux 1511 F.... pulseaudio
 /dev/snd/controlC0: karlflux 1511 F.... pulseaudio
Date: Wed Oct 30 10:15:23 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-10-02 (27 days ago)
InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Beta amd64 (20130925.1)
MachineType: ASUSTeK Computer Inc. K53BR
MarkForUpload: True
ProcFB:
 0 radeondrmfb
 1 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=b9724cb2-3973-4605-85f1-2f1777afd02a ro quiet splash radeon.dpm=1 vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-12-generic N/A
 linux-backports-modules-3.11.0-12-generic N/A
 linux-firmware 1.116
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:
 Oct 30 08:57:24 kohvi kernel: [ 1711.700492] perf samples too long (2519 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
 Oct 30 09:12:29 kohvi NetworkManager[704]: <warn> nl_recvmsgs() error: (-33) Dump inconsistency detected, interrupted
 Oct 30 09:38:29 kohvi NetworkManager[704]: <warn> nl_recvmsgs() error: (-33) Dump inconsistency detected, interrupted
dmi.bios.date: 04/25/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 207
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: K53BR
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr207:bd04/25/2012:svnASUSTeKComputerInc.:pnK53BR:pvr1.0:rvnASUSTeKComputerInc.:rnK53BR:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: K53BR
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

This message is due to the following commit:

commit 14c63f17b1fde5a575a28e96547a22b451c71fb5
Author: Dave Hansen <email address hidden>
Date: Fri Jun 21 08:51:36 2013 -0700

    perf: Drop sample rate when sampling is too slow

https://lkml.org/lkml/2013/5/29/640

[Luis Alvarado (luisalvarado)]

This message appears for me exactly before the wireless connection drops on my Asus Z87-Pro motherboard. The wireless card in question is the:

Network controller [0280]: Qualcomm Atheros AR9462 Wireless Network Adapter [168c:0034] (rev 01)

Using Ubuntu 14.04 64 Bit. Kerne l3.13.0-26-generic

[Oliver Weis (oliver-c)]

Since todays kernel update (3.13.0-46.76 -> 3.13.0-46.77) I also see this message in my kern.log It has not been there before and I'm just wondering what will happen if this continues as the "too long" value seems to be continiously rising and the sample rate is being lowered

Mar 3 07:14:57 sigma kernel: [ 9.748740] NFSD: starting 90-second grace period (net ffffffff81cdaa00)
Mar 3 07:16:26 sigma kernel: [ 102.269932] ip_tables: (C) 2000-2006 Netfilter Core Team
Mar 3 07:16:26 sigma kernel: [ 102.279642] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
Mar 3 07:16:26 sigma kernel: [ 102.304003] ip6_tables: (C) 2000-2006 Netfilter Core Team
Mar 3 07:16:50 sigma kernel: [ 126.135981] perf samples too long (2621 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
Mar 3 07:23:11 sigma kernel: [ 507.343615] perf samples too long (5025 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
Mar 3 08:07:24 sigma kernel: [ 3159.511565] perf samples too long (10036 > 10000), lowering kernel.perf_event_max_sample_rate to 12500

Happens on a KVM based Ubuntu 14.04 with 12GB RAM and 4 Cores. Also another problem is that IPv6 is not working any more during bootup after todays kernel update thus nginx can not bind to the IPv6 address given in the configuration and refuses to start up. Kernels should be tested more before releasing these updates...