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Message-Id: <20100115.010450.64181969.davem@davemloft.net> Date: Fri, 15 Jan 2010 01:04:50 -0800 (PST) From: David Miller <davem@...emloft.net> To: simon.kagstrom@...insight.net Cc: krkumar2@...ibm.com, ilpo.jarvinen@...sinki.fi, netdev@...r.kernel.org, eric.dumazet@...il.com Subject: Re: [RFC] [PATCH] Optimize TCP sendmsg in favour of fast devices? From: Simon Kagstrom <simon.kagstrom@...insight.net> Date: Fri, 15 Jan 2010 10:00:11 +0100 > On Fri, 15 Jan 2010 00:52:24 -0800 (PST) > David Miller <davem@...emloft.net> wrote: > >> > The same thing goes for via-velocity.c, it's turned on via ethtool >> > though (ethtool_op_set_sg). >> >> Indeed, see my reply to Krishna's ethtool_op_set_sg() patch. >> >> I think it's a cruddy way to do things, SG ought to be on by >> default always unless it is defective. And if it's defective >> support should be removed entirely. > > I kept it off by default since I didn't see any big improvement in my > tests (negative in some, positive in some). But I suppose you're > right though. Well, it has to provide significantly better performance for sendfile() (especially wrt. cpu utilization) because we avoid the copy out of the page cache pages entirely. -- 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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