Date: Wed, 18 Jul 2007 20:48:21 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Scott Bennett <bennett@cs.niu.edu> Cc: freebsd-net@freebsd.org, freebsd-current@freebsd.org, Max Laier <max@love2party.net> Subject: Re: Reminder: NET_NEEDS_GIANT, debug.mpsafenet going away in Message-ID: <20070718204552.G1096@fledge.watson.org> In-Reply-To: <200707181807.l6II7twY010844@mp.cs.niu.edu> References: <200707181807.l6II7twY010844@mp.cs.niu.edu>
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On Wed, 18 Jul 2007, Scott Bennett wrote: > [Cc: list trimmed a bit more --SB] > On Tue, 17 Jul 2007 23:42:14 +0200 Max Laier <max@love2party.net> > >> [ Excess CC-list ... testers needed!!! ] >> >> On Tuesday 17 July 2007, Robert Watson wrote: > > I missed Robert Watson's start of thread, so I'm jumping in here > with a question. > >>> This is a reminder e-mail that, in the very near future, Giant >>> compatibility shims for network protocols will be removed. > > How, if at all, will this affect qemu users? qemu exits unless AIO is > present in the kernel (or aio.ko has been kldload-ed). In FreeBSD 6.2, AIO > results in a warning message at boot time that says AIO is not MPSAFE and > that therefore the networking stack will take a deep performance hit. Per several earlier e-mails in the thread, AIO is MPSAFE in FreeBSD 7.0 and, as such, unaffected by this change. As a result, I would expect that applications depending on AIO should now perform significantly better (but have done no measurement in this area). Robert N M Watson Computer Laboratory University of Cambridge
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