menuconfig IP_DCCP tristate "The DCCP Protocol" depends on INET ---help--- Datagram Congestion Control Protocol (RFC 4340) From http://www.ietf.org/rfc/rfc4340.txt: The Datagram Congestion Control Protocol (DCCP) is a transport protocol that implements bidirectional, unicast connections of congestion-controlled, unreliable datagrams. It should be suitable for use by applications such as streaming media, Internet telephony, and on-line games. To compile this protocol support as a module, choose M here: the module will be called dccp. If in doubt, say N. if IP_DCCP config INET_DCCP_DIAG depends on INET_DIAG def_tristate y if (IP_DCCP = y && INET_DIAG = y) def_tristate m source "net/dccp/ccids/Kconfig" menu "DCCP Kernel Hacking" depends on DEBUG_KERNEL=y config IP_DCCP_DEBUG bool "DCCP debug messages" ---help--- Only use this if you're hacking DCCP. When compiling DCCP as a module, this debugging output can be toggled by setting the parameter dccp_debug of the `dccp' module to 0 or 1. Just say N. config NET_DCCPPROBE tristate "DCCP connection probing" depends on PROC_FS && KPROBES ---help--- This module allows for capturing the changes to DCCP connection state in response to incoming packets. It is used for debugging DCCP congestion avoidance modules. If you don't understand what was just said, you don't need it: say N. Documentation on how to use DCCP connection probing can be found at: http://www.linuxfoundation.org/collaborate/workgroups/networking/dccpprobe To compile this code as a module, choose M here: the module will be called dccp_probe. endmenu endif # IP_DDCP href='/cgit.cgi/linux/net-next.git/refs/?h=nds-private-remove&id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>refslogtreecommitdiff
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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2017-02-03 14:18:39 -0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-02-04 00:11:08 +0100
commit6e978b22efa1db9f6e71b24440b5f1d93e968ee3 (patch)
treec666f7a26b860674848949e39a610222b0723f89 /sound/soc/codecs/wm8731.c
parent3c223c19aea85d3dda1416c187915f4a30b04b1f (diff)
cpufreq: intel_pstate: Disable energy efficiency optimization
Some Kabylake desktop processors may not reach max turbo when running in HWP mode, even if running under sustained 100% utilization. This occurs when the HWP.EPP (Energy Performance Preference) is set to "balance_power" (0x80) -- the default on most systems. It occurs because the platform BIOS may erroneously enable an energy-efficiency setting -- MSR_IA32_POWER_CTL BIT-EE, which is not recommended to be enabled on this SKU. On the failing systems, this BIOS issue was not discovered when the desktop motherboard was tested with Windows, because the BIOS also neglects to provide the ACPI/CPPC table, that Windows requires to enable HWP, and so Windows runs in legacy P-state mode, where this setting has no effect. Linux' intel_pstate driver does not require ACPI/CPPC to enable HWP, and so it runs in HWP mode, exposing this incorrect BIOS configuration. There are several ways to address this problem. First, Linux can also run in legacy P-state mode on this system. As intel_pstate is how Linux enables HWP, booting with "intel_pstate=disable" will run in acpi-cpufreq/ondemand legacy p-state mode. Or second, the "performance" governor can be used with intel_pstate, which will modify HWP.EPP to 0. Or third, starting in 4.10, the /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference attribute in can be updated from "balance_power" to "performance". Or fourth, apply this patch, which fixes the erroneous setting of MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default configuration to function as designed. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Len Brown <len.brown@intel.com> Cc: 4.6+ <stable@vger.kernel.org> # 4.6+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'sound/soc/codecs/wm8731.c')