netdev - Re: [PATCHv2 vringh 1/3] remoteproc: Add support for vringh (Host vrings)

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Message-ID: <CAK=Wgbam=Y5GJQxg2DSt2yR6CdcDxjZ5k_Av_0H8+6m+scN+Yw@mail.gmail.com>
Date:	Thu, 21 Feb 2013 19:55:13 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Sjur Brændeland <sjurbren@...il.com>
Cc:	Dmitry Tarnyagin <dmitry.tarnyagin@...ricsson.com>,
	netdev@...r.kernel.org, Linus Walleij <linus.walleij@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Erwan Yvin <erwan.yvin@...ricsson.com>,
	virtualization <virtualization@...ts.linux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>, Ido Yariv <ido@...ery.com>
Subject: Re: [PATCHv2 vringh 1/3] remoteproc: Add support for vringh (Host vrings)

Hi Sjur,

On Thu, Feb 21, 2013 at 7:28 PM, Sjur Brændeland <sjurbren@...il.com> wrote:
> The motivation for using vringh was to avoid copying buffers
> when sending data from the modem to the host.

I may be missing something here, but why do you need vringh for that?

With rpmsg (which uses two regular vrings) both ends send huge amount
of data without copying it - we just send the pointers across.

Thanks,
Ohad.
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