From: Stephen Hemminger <stephen@networkplumber.org>
To: Tyler Retzlaff <roretzla@linux.microsoft.com>
Cc: dev@dpdk.org, Harry van Haaren <harry.van.haaren@intel.com>,
Remy Horton <remy.horton@intel.com>,
Reshma Pattan <reshma.pattan@intel.com>,
stable@dpdk.org
Subject: Re: [PATCH] latencystats: fix missing f suffix on literal float
Date: Mon, 15 Apr 2024 15:17:38 -0700 [thread overview]
Message-ID: <20240415151738.2b85fc05@hermes.local> (raw)
In-Reply-To: <1713216746-25584-1-git-send-email-roretzla@linux.microsoft.com>
On Mon, 15 Apr 2024 14:32:26 -0700
Tyler Retzlaff <roretzla@linux.microsoft.com> wrote:
> Add missing f suffix to floating point literal to avoid warning about
> truncation from double to float.
>
> Fixes: 5cd3cac9ed22 ("latency: added new library for latency stats")
> Cc: reshma.pattan@intel.com
> Cc: stable@dpdk.org
>
> Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
> ---
> lib/latencystats/rte_latencystats.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/latencystats/rte_latencystats.c b/lib/latencystats/rte_latencystats.c
> index 4ea9b0d..cae4b50 100644
> --- a/lib/latencystats/rte_latencystats.c
> +++ b/lib/latencystats/rte_latencystats.c
> @@ -166,7 +166,7 @@ struct latency_stats_nameoff {
> * a constant smoothing factor between 0 and 1. The value
> * is used below for measuring average latency.
> */
> - const float alpha = 0.2;
> + const float alpha = 0.2f;
>
> now = rte_rdtsc();
> for (i = 0; i < nb_pkts; i++) {
The use of floating point in fast path here is unnecessary.
Even without doing the full per-core values, this could just change
to an alpha of .25 and use fast fixed point math.
next prev parent reply other threads:[~2024-04-15 22:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-15 21:32 Tyler Retzlaff
2024-04-15 22:17 ` Stephen Hemminger [this message]
2024-04-15 23:14 ` Tyler Retzlaff
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