* rte_eth_stats_get seems slow
@ 2025-04-25 11:52 Morten Brørup
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From: Morten Brørup @ 2025-04-25 11:52 UTC (permalink / raw)
To: bruce.richardson; +Cc: Ian Stokes, dev
Bruce,
rte_eth_stats_get() on Intel NICs seems slow to me.
E.g. getting the stats on a single port takes ~132 us (~451,000 CPU cycles) using the igb driver, and ~50 us using the i40e driver.
Referring to the igb driver source code [1], it's 44 calls to E1000_READ_REG(), so the math says that each one takes 3 us (~10,000 CPU cycles).
Is this expected behavior?
It adds up, e.g. it takes a full millisecond to fetch the stats from eight ports using the igb driver.
[1]: https://elixir.bootlin.com/dpdk/v24.11.1/source/drivers/net/e1000/igb_ethdev.c#L1724
Med venlig hilsen / Kind regards,
-Morten Brørup
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