netdev - RE: [PATCH] net-packet: tx timestamping on tpacket ring

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B71D1@saturn3.aculab.com>
Date:	Mon, 15 Apr 2013 10:45:55 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Daniel Borkmann" <dborkman@...hat.com>,
	"Willem de Bruijn" <willemb@...gle.com>
Cc:	<paul.chavent@...ra.fr>, <richardcochran@...il.com>,
	<edumazet@...gle.com>, <daniel.borkmann@....ee.ethz.ch>,
	<xemul@...allels.com>, <ebiederm@...ssion.com>,
	<netdev@...r.kernel.org>
Subject: RE: [PATCH] net-packet: tx timestamping on tpacket ring

> > +	case TPACKET_V1:
> > +		h1 = frame;
> > +		h1->tp_sec = ts.tv_sec;
> > +		h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
> > +
> > +		flush_dcache_page(pgv_to_page(&h1->tp_sec));
> > +		flush_dcache_page(pgv_to_page(&h1->tp_usec));
> 
> Hmm, not sure, but could we also flush the dcache only once?

If it isn't a silly question, why is the dcache being flushed
here at all?

	David



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