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From: Stephen Hemminger <stephen@networkplumber.org>
To: "Morten Brørup" <mb@smartsharesystems.com>
Cc: "Michael Baum" <michaelba@nvidia.com>, <dev@dpdk.org>,
	"Ori Kam" <orika@nvidia.com>,
	"Aman Singh" <aman.deep.singh@intel.com>,
	"Yuying Zhang" <yuying.zhang@intel.com>,
	"Ferruh Yigit" <ferruh.yigit@amd.com>,
	"Thomas Monjalon" <thomas@monjalon.net>
Subject: Re: [PATCH v2 0/2] ethdev: add random item support
Date: Mon, 11 Sep 2023 10:53:21 -0700	[thread overview]
Message-ID: <20230911105321.6e17708d@fedora> (raw)
In-Reply-To: <98CBD80474FA8B44BF855DF32C47DC35D87BA0@smartserver.smartshare.dk>

On Mon, 11 Sep 2023 18:55:45 +0200
Morten Brørup <mb@smartsharesystems.com> wrote:

> > From: Michael Baum [mailto:michaelba@nvidia.com]
> > Sent: Monday, 11 September 2023 08.42
> > 
> > Add support for matching random value using new
> > "rte_flow_item_random" structure.  
> 
> I get it. It can be used for things like stochastic sampling.
> 
> However, it doesn't provide support for e.g. 1/100 or 1/500.
> 
> So here's a suggestion:
> 
> Instead of "value" (which is irrelevant) & "mask" (which is what
> really controls the probability), wouldn't it be better if "value"
> was an inverse probability (and "mask" was irrelevant)? E.g.
> value=500 means that there is a 1 of 500 probability of a match.
> 
> Would this kind of random item better serve the purpose?
> 
> Or is the random item, in its current form, also required for other
> purposes?
> 

For netem (Linux kernel) needed to support expressing a percent in fixed
point number. The solution was to express it as:
    Percent = X / UINT32_MAX

  reply	other threads:[~2023-09-11 17:53 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-08-22  9:05 [PATCH v1 " Michael Baum
2023-08-22  9:05 ` [PATCH v1 1/2] " Michael Baum
2023-08-22  9:05 ` [PATCH v1 2/2] app/testpmd: " Michael Baum
2023-08-22 12:41 ` [PATCH v1 0/2] ethdev: " Ivan Malov
2023-08-22 14:09   ` Michael Baum
2023-08-22 14:09   ` Stephen Hemminger
2023-09-11  7:41 ` [PATCH v2 " Michael Baum
2023-09-11  7:41   ` [PATCH v2 1/2] " Michael Baum
2023-09-11 15:59     ` Thomas Monjalon
2023-10-12 10:14       ` Michael Baum
2023-09-11  7:41   ` [PATCH v2 2/2] app/testpmd: " Michael Baum
2023-09-18 11:44     ` Ori Kam
2023-09-11 16:55   ` [PATCH v2 0/2] ethdev: " Morten Brørup
2023-09-11 17:53     ` Stephen Hemminger [this message]
2023-10-12  9:48       ` Michael Baum
2023-09-12  8:40     ` Michael Baum
2023-11-30 16:32   ` [PATCH v3 " Michael Baum
2023-11-30 16:32     ` [PATCH v3 1/2] " Michael Baum
2023-12-08 18:54       ` Dariusz Sosnowski
2023-12-14 10:32         ` Michael Baum
2023-12-14 10:54           ` Dariusz Sosnowski
2023-12-08 19:03       ` Dariusz Sosnowski
2023-11-30 16:32     ` [PATCH v3 2/2] app/testpmd: " Michael Baum
2023-12-08 18:52       ` Dariusz Sosnowski
2023-12-14 10:58     ` [PATCH v4 0/2] ethdev: " Michael Baum
2023-12-14 10:58       ` [PATCH v4 1/2] " Michael Baum
2023-12-14 11:12         ` Dariusz Sosnowski
2023-12-14 11:32         ` Ori Kam
2023-12-14 12:18         ` Ferruh Yigit
2023-12-14 13:43           ` Michael Baum
2023-12-14 15:55             ` Ferruh Yigit
2023-12-15  7:47               ` Michael Baum
2023-12-14 10:58       ` [PATCH v4 2/2] app/testpmd: " Michael Baum
2023-12-15 12:07       ` [PATCH v4 0/2] ethdev: " Ferruh Yigit

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