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From: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.com>
Cc: Li Feng <fengli@smartx.com>,
	Bruce Richardson <bruce.richardson@intel.com>,
	lifeng1519@gmail.com, dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] librte_eal: add APIs to speedup virt2iova/phys
Date: Mon, 20 Apr 2020 16:07:05 +0300
Message-ID: <20200420160705.1652aeae@Sovereign> (raw)
In-Reply-To: <bc7ce6c4-e545-2f2b-a1cb-34a56d66b4b7@intel.com>

> On 20-Apr-20 12:09 PM, Li Feng wrote:
> > Using pread to replace lseek + read.
> > And add new APIs to reduce open/close/lseek system call frequency when the
> > user needs to convert a large range of virtual address space.
> >      - rte_mem_virt2iova_with_fd
> >      - rte_mem_virt2phy_with_fd
> > 
> > Currently it will be used by spdk in spdk_mem_register.
> > 
> > Signed-off-by: Li Feng <fengli@smartx.com>
> > ---  
> 
> These API's are IMO already on the verge of what's acceptable because of 
> the differences between PA, DPDK IOVA and external memory IOVA. I'm not 
> sure building on top of them is a good idea. It's also quite platform 
> specific - rte_mem_virt2phy could potentially work with Windows (and in 
> fact there was an RFC for it), but would this API work with Windows, 
> given that Windows doesn't have fd's? Should we perhaps replace fd's 
> with an opaque structure pointer, so that each platform-specific 
> implementation could dereference it the way it needs to, without 
> exposing internal details of the platform?

These new APIs are, in fact, Linux-specific. Doubtfully will Windows ever
benefit from it even with fd abstracted, though I can't say for FreeBSD. Given
the linked suggestion to move rte_vfio_container_dma_map/unmap to some
include/linux header, maybe these APIs could land there too?

	http://mails.dpdk.org/archives/dev/2020-April/164404.html

-- 
Dmitry Kozlyuk

  reply	other threads:[~2020-04-20 13:07 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-20 11:09 Li Feng
2020-04-20 12:16 ` Burakov, Anatoly
2020-04-20 13:07   ` Dmitry Kozlyuk [this message]
2020-04-20 14:13     ` Li Feng
2021-03-25 13:32       ` David Marchand
2021-03-29  6:26         ` Li Feng
2021-04-01 10:38         ` Burakov, Anatoly
2021-04-06 10:40           ` Feng Li
2021-04-06 11:23             ` David Marchand

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