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Date: Wed, 24 Sep 2008 00:53:35 -0400 From: Bill Fink <billfink@...dspring.com> To: Herbert Xu <herbert@...dor.apana.org.au> Cc: Evgeniy Polyakov <johnpol@....mipt.ru>, davem@...emloft.net, johaahn@...il.com, netdev@...r.kernel.org Subject: Re: [PATCH] sendfile() and UDP socket On Tue, 23 Sep 2008, Herbert Xu wrote: > On Tue, Sep 23, 2008 at 10:27:10AM +0400, Evgeniy Polyakov wrote: > > On Tue, Sep 23, 2008 at 12:54:27PM +0800, Herbert Xu (herbert@...dor.apana.org.au) wrote: > > > I think this dicussion is moot since the only time you want to use > > > sendfile is for bulk transfers and these days anybody designing new > > > applications that does bulk transfers over UDP should be taken out > > > and shot. > > > > One can protect himself pointing how slow may be memory bus in some > > hardware setup, which completely does not allow to perform any copy. > > Yes but bulk transfers over UDP is a bad idea regardless of how > slow your bus is :) > > So what application needs this? It seems it might be useful for a video server. The one thing that seems to be missing from the sendfile() semantics is a message size to be used for splitting the file into UDP datagrams, but this could be provided by a separate ioctl(), and could default to the largest message size that would fit in the MTU. -Bill -- 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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