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Open Source and information security mailing list archives
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Date: Sun, 19 Aug 2007 17:47:59 -0700 From: "Felix Marti" <felix@...lsio.com> To: "David Miller" <davem@...emloft.net> Cc: <sean.hefty@...el.com>, <netdev@...r.kernel.org>, <rdreier@...co.com>, <general@...ts.openfabrics.org>, <linux-kernel@...r.kernel.org>, <jeff@...zik.org> Subject: RE: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate PS_TCPportsfrom the host TCP port space. > -----Original Message----- > From: David Miller [mailto:davem@...emloft.net] > Sent: Sunday, August 19, 2007 5:40 PM > To: Felix Marti > Cc: sean.hefty@...el.com; netdev@...r.kernel.org; rdreier@...co.com; > general@...ts.openfabrics.org; linux-kernel@...r.kernel.org; > jeff@...zik.org > Subject: Re: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate > PS_TCPportsfrom the host TCP port space. > > From: "Felix Marti" <felix@...lsio.com> > Date: Sun, 19 Aug 2007 17:32:39 -0700 > > [ Why do you put that "[Felix Marti]" everywhere you say something? > It's annoying and superfluous. The quoting done by your mail client > makes clear who is saying what. ] > > > Hmmm, interesting... I guess it is impossible to even have > > a discussion on the subject. > > Nice try, Herbert Xu gave a great explanation. [Felix Marti] David and Herbert, so you agree that the user<>kernel space memory copy overhead is a significant overhead and we want to enable zero-copy in both the receive and transmit path? - Yes, copy avoidance is mainly an API issue and unfortunately the so widely used (synchronous) sockets API doesn't make copy avoidance easy, which is one area where protocol offload can help. Yes, some apps can resort to sendfile() but there are many apps which seem to have trouble switching to that API... and what about the receive path? - 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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