Date: Fri, 1 Dec 2000 18:06:22 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: David Greenman <dg@root.com> Cc: Andrew Gallatin <gallatin@cs.duke.edu>, Bosko Milekic <bmilekic@technokratis.com>, "Kenneth D. Merry" <ken@kdm.org>, arch@FreeBSD.ORG, alfred@FreeBSD.ORG Subject: Re: zero copy code review Message-ID: <Pine.BSF.4.21.0012011805210.46782-100000@beppo.feral.com> In-Reply-To: <200012020202.SAA14681@implode.root.com>
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> > > >> > >> David Greenman writes: > >> > Oops. The original assumption (and code that I wrote) was that M_WAIT > >> > _cannot_ return a NULL pointer. This was changed in FreeBSD recently, and > >> > >> Yes, that's always been my assumption too. That's why I never noticed > >> it... > > > >IIRC, this has never been guaranteed. It's often unlikely that a request can't > >be satisfied after a sleep with the current code. > > FreeBSD blocked indefinitly and never returned a NULL pointer. Smells like livelock somewhere here, but has it changed recently as has been asserted? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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