Date: Fri, 8 Jan 2016 12:44:32 -0800 From: NGie Cooper <yaneurabeya@gmail.com> To: Gleb Smirnoff <glebius@FreeBSD.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r293439 - in head: lib/libc/sys sys/dev/ti sys/kern sys/sys usr.bin/netstat Message-ID: <96B980EE-FD2F-490E-BA5E-4F23A67CEB18@gmail.com> In-Reply-To: <201601082034.u08KYvLv075281@repo.freebsd.org> References: <201601082034.u08KYvLv075281@repo.freebsd.org>
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> On Jan 8, 2016, at 12:34, Gleb Smirnoff <glebius@FreeBSD.org> wrote: >=20 > Author: glebius > Date: Fri Jan 8 20:34:57 2016 > New Revision: 293439 > URL: https://svnweb.freebsd.org/changeset/base/293439 >=20 > Log: > New sendfile(2) syscall. A joint effort of NGINX and Netflix from = 2013 and > up to now. >=20 > The new sendfile is the code that Netflix uses to send their multiple = tens > of gigabits of data per second. The new implementation features = asynchronous > I/O, when I/O operations are launched, but not awaited to be = complete. An > explanation of why such behavior is beneficial compared to old one is > going to be too long for a commit message, so we will skip it here. >=20 > Additional features of new syscall are extra flags, which provide an > application more control over data sent. The SF_NOCACHE flag tells > kernel that data shouldn't be cached after it was sent. The = SF_READAHEAD() > macro allows to specify readahead size in pages. >=20 > The new syscalls is a drop in replacement. No modifications are = required > to applications. One can take nginx binary for stable/10 and run it > successfully on head. Although SF_NODISKIO lost its original sense, = as now > sendfile doesn't block, and now means something completely different = (tm), > using the new sendfile the old way is absolutely safe. >=20 > Celebrates: Netflix global launch! > Sponsored by: Nginx, Inc. > Sponsored by: Netflix > Relnotes: yes Did anyone review these changes and the other changes made recently to = sys/kern and sys/net* ? Thanks, -NGie=
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