Date: Mon, 24 Jun 2002 19:11:40 +0200 From: Andre Oppermann <oppermann@tix.ch> To: Mike Silbersack <silby@silby.com> Cc: "Kenneth D. Merry" <ken@kdm.org>, net@freebsd.org, current@freebsd.org Subject: Re: zero copy code checkin in 2 days, new snapshot Message-ID: <3D1752CC.B21627F1@tix.ch> References: <20020624120341.K53369-100000@patrocles.silby.com>
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Mike Silbersack wrote: > > On Mon, 24 Jun 2002, Kenneth D. Merry wrote: > > > On Mon, Jun 24, 2002 at 01:17:03 -0500, Mike Silbersack wrote: > > > On Sun, 23 Jun 2002, Kenneth D. Merry wrote: > > > > > > > I'm planning on checking in the zero copy sockets code Tuesday evening, > > > > MDT. If there are any concerns, I'm more than willing to delay it. > > > > > > Out of curiousity, what happens when the page being write()n is a mmap'd > > > page shared by multiple processes? Will the page be shared? That could > > > be a big reduction in mbuf cluster usage on some http/ftp systems, I'd > > > guess. > > > > The page would be shared, until one of the processes decides to write to it > > while it is still referenced in the kernel. If that happens, it'll get > > copied. > > > > Ken > > Cool, thttpd / others should benefit greatly then. The last time I checked thttpd didn't even use sendfile(2). It does use accf_http(9). Maybe kqueue(2) could speed it up further. -- Andre To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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