On Thu, Jul 11, 2002 at 04:10:32PM -0700, Julian Elischer wrote: > Don't forget that "external" does not neccesarily mean "cluster". > I still consider the method used in (hmm was it NetBSD or OSF/1?) > to be very good.. > > mbufs that referred to the same object were linked together. > I forget the details exactly. maybe someone else can remember.. > it did it without ref counts somehow..
Yes, this is in NetBSD still and it is very elegant. I remember looking at this a long time ago but to be honest, the reason I didn't implement it then first escaped me. However, thanks to David Malone's awesome commit messages, I found it: rev 1.53 of sys/sys/mbuf.h, extract: [...] "NetBSD's system of linked lists of mbufs was cosidered, but Alfred felt it would have locking issues when the kernel was made more SMP friendly." [...] I think it's almost clear now that there are, in fact, no SMP issues with it (we don't do per-cluster locking, or anything ridiculous like that), so unless Alfred has the reason again, I'll consider that method again instead. Thanks for the constructive feedback. Regards, -- Bosko Milekic [EMAIL PROTECTED] [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-net" in the body of the message
