DPDK usage discussions
 help / color / mirror / Atom feed
* Measuring core frequency with dpdk
@ 2023-04-10 14:48 Antonio Di Bacco
  2023-04-10 16:12 ` Stephen Hemminger
  0 siblings, 1 reply; 2+ messages in thread
From: Antonio Di Bacco @ 2023-04-10 14:48 UTC (permalink / raw)
  To: users

Is it possible to measure the core frequency using a DPDK api? Not the
maximum or nominal frequency but the actual number of instruction
cycles per second.

Best regards,
Anna

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: Measuring core frequency with dpdk
  2023-04-10 14:48 Measuring core frequency with dpdk Antonio Di Bacco
@ 2023-04-10 16:12 ` Stephen Hemminger
  0 siblings, 0 replies; 2+ messages in thread
From: Stephen Hemminger @ 2023-04-10 16:12 UTC (permalink / raw)
  To: Antonio Di Bacco; +Cc: users

On Mon, 10 Apr 2023 16:48:14 +0200
Antonio Di Bacco <a.dibacco.ks@gmail.com> wrote:

> Is it possible to measure the core frequency using a DPDK api? Not the
> maximum or nominal frequency but the actual number of instruction
> cycles per second.
> 
> Best regards,
> Anna

The Time Stamp Counter https://en.wikipedia.org/wiki/Time_Stamp_Counter
gets incremented at the CPU clock rate. DPDK API to read the TSC
clock rate is rte_get_tsc_hz().

Internally, the DPDK determines the clock rate either by using
architecture specific information if available or simple heuristic
of number of ticks by doing a sleep().  See lib/eal/common/eal_common_timer.c
for the details.

^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2023-04-10 16:12 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-04-10 14:48 Measuring core frequency with dpdk Antonio Di Bacco
2023-04-10 16:12 ` Stephen Hemminger

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).