Date: Fri, 1 Dec 2000 18:01:04 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: dg@root.com, 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.4.21.0012011758110.46782-100000@beppo.feral.com> In-Reply-To: <14888.22179.833528.247128@grasshopper.cs.duke.edu>
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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. We used to kill off shell pipes by spraying Sparc-1s as a test. This was another reason (at the time) that SunOS (4.2based with 4.3 changes- pipes were implemented with mbufs) was considered eligible to be replaced with SVr4. -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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