Date: Tue, 23 Oct 2012 16:11:16 +0100 From: David Chisnall <theraven@FreeBSD.org> To: Andre Oppermann <andre@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, Gleb Smirnoff <glebius@FreeBSD.org>, src-committers@FreeBSD.org Subject: Re: svn commit: r241931 - in head/sys: conf kern Message-ID: <AAEAF03E-2C78-4195-825D-D8B0A05D6A37@FreeBSD.org> In-Reply-To: <5086B24C.9000606@freebsd.org> References: <201210231419.q9NEJjYH082863@svn.freebsd.org> <20121023144211.GX70741@FreeBSD.org> <5086B24C.9000606@freebsd.org>
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On 23 Oct 2012, at 16:05, Andre Oppermann wrote: > For zero copy send we're trying to come up with a sendfile-like > approach where the page is simply wired into kernel space. The > application then is not allowed to touch it until the socket > buffer has released it again. The main issue here is how to > provide feedback to the application when it is safe for reuse. It's been a few years since I used it, but I thought that aio_write() = already provided this. The application may not modify the contents of = the memory pointed to by aio_buf until after it has received = notification that the write has finished. This happens either via a = signal directly, a signal polled by kqueue, or a call to aio_return(). David=
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