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From: Stephen Hemminger <stephen@networkplumber.org>
To: Vivien Didelot <vivien.didelot@gmail.com>
Cc: dev@dpdk.org, Olivier Matz <olivier.matz@6wind.com>,
	Ferruh Yigit <ferruh.yigit@intel.com>,
	Patrick Keroulas <patrick.keroulas@radio-canada.ca>
Subject: Re: [dpdk-dev] [RFC PATCH 3/3] net/pcap: support hardware Tx timestamps
Date: Tue, 30 Jun 2020 07:59:22 -0700
Message-ID: <20200630075922.7f9ecc7b@hermes.lan> (raw)
In-Reply-To: <20200625190119.265739-4-vivien.didelot@gmail.com>

On Thu, 25 Jun 2020 15:01:19 -0400
Vivien Didelot <vivien.didelot@gmail.com> wrote:

> +		struct timeval cur_time = {
> +			.tv_sec = cycles / hz,
> +			.tv_usec = (cycles % hz) * NSEC_PER_SEC / hz,

This is hot path, use rte_reciprocal_divide rather than slow divide instruction.

  parent reply	other threads:[~2020-06-30 14:59 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-25 19:01 [dpdk-dev] [RFC PATCH 0/3] mlx5 to PCAP capture with hardware timestamps Vivien Didelot
2020-06-25 19:01 ` [dpdk-dev] [RFC PATCH 1/3] net/mlx5: add timestamp-to-ns converter from libibverbs Vivien Didelot
2020-06-26  6:41   ` Olivier Matz
2020-07-07 15:23     ` PATRICK KEROULAS
2020-06-25 19:01 ` [dpdk-dev] [RFC PATCH 2/3] ethdev: add API to convert raw timestamps to nsec Vivien Didelot
2020-06-25 19:01 ` [dpdk-dev] [RFC PATCH 3/3] net/pcap: support hardware Tx timestamps Vivien Didelot
2020-06-26  6:48   ` Olivier Matz
2020-07-06 18:36     ` PATRICK KEROULAS
2020-07-07 14:47       ` Olivier Matz
2020-07-10 19:23         ` PATRICK KEROULAS
2020-06-30 14:59   ` Stephen Hemminger [this message]
2020-07-08 14:34 ` [dpdk-dev] [RFC PATCH 0/3] mlx5 to PCAP capture with hardwaretimestamps Morten Brørup

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