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From: Thomas Monjalon <thomas@monjalon.net>
To: Marvin Liu <yong.liu@intel.com>
Cc: bruce.richardson@intel.com, stephen@networkplumber.org,
	dev@dpdk.org, david.marchand@redhat.com, ferruh.yigit@intel.com,
	maxime.coquelin@redhat.com, honnappa.nagarahalli@arm.com,
	David Christensen <drc@linux.vnet.ibm.com>,
	ruifeng.wang@arm.com
Subject: Re: [dpdk-dev] [PATCH v2] config: enable packet data prefetch
Date: Thu, 15 Oct 2020 00:02:37 +0200
Message-ID: <3900730.QmOVHUWFXi@thomas> (raw)
In-Reply-To: <20200923015131.101203-1-yong.liu@intel.com>

23/09/2020 03:51, Marvin Liu:
> Data prefetch instruction can preload data into cpu’s hierarchical
> cache before data access. Virtualized data paths like virtio utilized
> this feature for acceleration. Since most modern cpus have support
> prefetch function, we can enable packet data prefetch as default.
> 
> Signed-off-by: Marvin Liu <yong.liu@intel.com>
> ---
> +#define RTE_PMD_PACKET_PREFETCH 1

We could also remove the related #ifdefs.

What can be the drawback of always enable those prefetches?



  reply	other threads:[~2020-10-14 22:02 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-22  8:21 [dpdk-dev] [PATCH] build: " Marvin Liu
2020-09-22 14:11 ` Stephen Hemminger
2020-09-23  2:00   ` Liu, Yong
2020-09-23  1:51 ` [dpdk-dev] [PATCH v2] config: " Marvin Liu
2020-10-14 22:02   ` Thomas Monjalon [this message]
2020-10-15  1:21     ` Liu, Yong
2020-10-15  4:09       ` Honnappa Nagarahalli
2020-10-15  8:23         ` Liu, Yong
2020-10-15  9:21           ` Thomas Monjalon
2020-10-15 14:38             ` Honnappa Nagarahalli
2020-11-03  1:57   ` [dpdk-dev] [PATCH v3] drivers/net: enable packet data prefetch on x86 Marvin Liu

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