netdev - Re: [Lsf] [Lsf-pc] [LSF/MM TOPIC] Generic page-pool recycle facility?

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Message-ID: <20160412082838.4ce17c1a@redhat.com>
Date:	Tue, 12 Apr 2016 08:28:38 +0200
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	Alexander Duyck <alexander.duyck@...il.com>
Cc:	"lsf@...ts.linux-foundation.org" <lsf@...ts.linux-foundation.org>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Sagi Grimberg <sagi@...mberg.me>,
	Tom Herbert <tom@...bertland.com>,
	Brenden Blanco <bblanco@...mgrid.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-mm <linux-mm@...ck.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Bart Van Assche <bart.vanassche@...disk.com>,
	"lsf-pc@...ts.linux-foundation.org" 
	<lsf-pc@...ts.linux-foundation.org>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	brouer@...hat.com
Subject: Re: [Lsf] [Lsf-pc] [LSF/MM TOPIC] Generic page-pool recycle
 facility?


On Mon, 11 Apr 2016 15:02:51 -0700 Alexander Duyck <alexander.duyck@...il.com> wrote:

> Have you taken a look at possibly trying to optimize the DMA pool API
> to work with pages?  It sounds like it is supposed to do something
> similar to what you are wanting to do.

Yes, I have looked at the mm/dmapool.c API. AFAIK this is for DMA
coherent memory (see use of dma_alloc_coherent/dma_free_coherent). 

What we are doing is "streaming" DMA memory, when processing the RX
ring.

(NIC are only using DMA coherent memory for the descriptors, which are
allocated on driver init)
-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer