Enum CounterWidth 

pub enum CounterWidth {
    Unknown,
    Bits32,
    Bits64,
}

The bit width of a cumulative OS counter (§8.2).

The width is what separates a wraparound from a reset. A 32-bit interface counter read on a 64-bit host jumps back to a small value roughly every 34 seconds on a saturated gigabit link; reporting each of those as a reset would blank the interface row almost continuously. When the width is genuinely unknown there is no evidence to tell wrap from reset apart, so the conservative answer applies: report a reset and re-baseline.

Variants

Unknown

The width is not known, so every backwards move is treated as a reset.

The default, because guessing a width and guessing wrong fabricates traffic that never happened.

Bits32

A 32-bit counter, such as a legacy ifTable-style interface counter or a 32-bit device register widened to u64 by the caller.

Bits64

A 64-bit counter, such as Linux /proc/net/dev on a 64-bit kernel.

Included for completeness: at 100 Gbit/s a 64-bit byte counter takes over forty years to wrap, so in practice this behaves like CounterWidth::Unknown apart from rejecting absurd backwards jumps.

Implementations

impl CounterWidth

pub const fn bits(self) -> Option<u32>

The number of significant bits, or None when the width is unknown.

pub const fn max_value(self) -> Option<u64>

The largest value the counter can hold, or None when unknown.

Trait Implementations

impl Clone for CounterWidth

fn clone(&self) -> CounterWidth

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for CounterWidth

impl Debug for CounterWidth

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for CounterWidth

fn default() -> CounterWidth

Returns the “default value” for a type.

impl Eq for CounterWidth

impl Hash for CounterWidth

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for CounterWidth

fn eq(&self, other: &CounterWidth) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for CounterWidth