From: "Trahe, Fiona" <fiona.trahe@intel.com>
To: "dev@dpdk.org" <dev@dpdk.org>,
"Mrozowicz, SlawomirX" <slawomirx.mrozowicz@intel.com>
Cc: "Doherty, Declan" <declan.doherty@intel.com>,
"Griffin, John" <john.griffin@intel.com>,
"De Lara Guarch, Pablo" <pablo.de.lara.guarch@intel.com>,
"Trahe, Fiona" <fiona.trahe@intel.com>
Subject: Re: [dpdk-dev] [PATCH] app/crypto-perf: add minimise-offload-cost flag
Date: Wed, 12 Jul 2017 13:02:17 +0000 [thread overview]
Message-ID: <348A99DA5F5B7549AA880327E580B435892350C8@IRSMSX101.ger.corp.intel.com> (raw)
In-Reply-To: <1494346443-11130-1-git-send-email-fiona.trahe@intel.com>
> -----Original Message-----
> From: Trahe, Fiona
> Sent: Tuesday, May 9, 2017 5:14 PM
> To: dev@dpdk.org; Mrozowicz, SlawomirX <slawomirx.mrozowicz@intel.com>
> Cc: Doherty, Declan <declan.doherty@intel.com>; Griffin, John <john.griffin@intel.com>; De Lara Guarch,
> Pablo <pablo.de.lara.guarch@intel.com>; Trahe, Fiona <fiona.trahe@intel.com>
> Subject: [PATCH] app/crypto-perf: add minimise-offload-cost flag
>
> The throughput test enqueues and dequeues bursts of operations
> to the device. For software devices the full burst size will
> usually be successfully en/dequeued, on hardware devices
> however the CPU can call the API more frequently than necessary,
> as it has nothing else to do.
> Minimum offload cost is achieved when the specified
> burst_size is en/dequeued. So rather than
> wasting CPU cycles continually retrying, with a
> fraction of the burst being en/dequeued each time,
> fewer CPU cycles are used by backing off until a full
> burst can be enqueued.
>
> This patch adds a --minimise-offload-cost flag.
> When set the test backs off until full bursts are
> en/dequeued and counts the cycles while waiting.
> These cycles represent cycles saved by
> offloading, which in a real application are
> available for other work. Hence these cycles are
> deducted from the total cycle-count to show the
> minimum offload-cost which can be acheived.
>
> Signed-off-by: Fiona Trahe <fiona.trahe@intel.com>
Self-nack
As we're intending to push a better way to measure HW offload cost in next release.
prev parent reply other threads:[~2017-07-12 13:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-09 16:14 Fiona Trahe
2017-05-11 14:22 ` Kusztal, ArkadiuszX
2017-07-12 13:02 ` Trahe, Fiona [this message]
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