PCI_SET_LTR(9) Hardware Interfaces PCI_SET_LTR(9)NAME
pci_set_ltr - set LTR latency values
SYNOPSIS
int pci_set_ltr(struct pci_dev * dev, int snoop_lat_ns, int nosnoop_lat_ns);
ARGUMENTS
dev
PCI device
snoop_lat_ns
snoop latency in nanoseconds
nosnoop_lat_ns
nosnoop latency in nanoseconds
DESCRIPTION
Figure out the scale and set the LTR values accordingly.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 PCI_SET_LTR(9)
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hwloc_distances_s(3) Hardware Locality (hwloc) hwloc_distances_s(3)NAME
hwloc_distances_s -
SYNOPSIS
#include <hwloc.h>
Data Fields
unsigned relative_depth
unsigned nbobjs
float * latency
float latency_max
float latency_base
Detailed Description
Distances between objects.
One object may contain a distance structure describing distances between all its descendants at a given relative depth. If the containing
object is the root object of the topology, then the distances are available for all objects in the machine.
If the latency pointer is not NULL, the pointed array contains memory latencies (non-zero values), as defined by the ACPI SLIT
specification.
In the future, some other types of distances may be considered. In these cases, latency may be NULL.
Field Documentation
float* hwloc_distances_s::latency
Matrix of latencies between objects, stored as a one-dimension array. May be NULL if the distances considered here are not latencies.
Values are normalized to get 1.0 as the minimal value in the matrix. Latency from i-th to j-th object is stored in slot i*nbobjs+j.
float hwloc_distances_s::latency_base
The multiplier that should be applied to latency matrix to retrieve the original OS-provided latencies. Usually 10 on Linux since ACPI SLIT
uses 10 for local latency.
float hwloc_distances_s::latency_max
The maximal value in the latency matrix.
unsigned hwloc_distances_s::nbobjs
Number of objects considered in the matrix. It is the number of descendant objects at relative_depth below the containing object. It
corresponds to the result of hwloc_get_nbobjs_inside_cpuset_by_depth.
unsigned hwloc_distances_s::relative_depth
Relative depth of the considered objects below the object containing this distance information.
Author
Generated automatically by Doxygen for Hardware Locality (hwloc) from the source code.
Version 1.7 Sun Apr 7 2013 hwloc_distances_s(3)
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