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Date: Fri, 17 Aug 2007 18:28:07 -0700 From: Stephen Hemminger <shemminger@...ux-foundation.org> To: "Kok, Auke" <auke-jan.h.kok@...el.com> Cc: David Miller <davem@...emloft.net>, netdev@...r.kernel.org Subject: Re: [RFC] restore netdev_priv optimization (planb) On Fri, 17 Aug 2007 18:21:25 -0700 "Kok, Auke" <auke-jan.h.kok@...el.com> wrote: > David Miller wrote: > > From: Stephen Hemminger <shemminger@...ux-foundation.org> > > Date: Fri, 17 Aug 2007 17:49:09 -0700 > > > >> Fix optimization of netdev_priv() lost by the addition of multiqueue. > >> > >> Only configurations that define MULITQUEUE need the extra overhead in > >> netdevice structure and the loss of the netdev_priv optimization. > >> > >> Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org> > > > > Every distribution vendor is going to turn MULTIQUEUE on. Therefore > > %99 of Linux users will not see any gain from your patch. > > > > You're walking around in a dark room and hitting walls every > > few seconds. Take a moment and think about how to really deal > > with this generically for a second before churning out another > > patch. > > > > For example, how about making the multiqueue limit fixed, say at 64 > > queues, and declare the egress_queues as an array of 64 entries. Then > > you can get constant pointer formation for both the netdev priv and > > the queues. > > this sounds highly optimistic ("64 queues is enough for everyone"?) and probably > will be quickly outdated by both hardware and demand... > Plan C was replacing MULTIQUEUE boolean with a int value 1 ... 256. All this was a one day "what if" exercise, not really a big churn.. -- Stephen Hemminger <shemminger@...ux-foundation.org> - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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