Date: Thu, 20 Dec 2001 12:48:05 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: John Baldwin <jhb@FreeBSD.org> Cc: arch@freebsd.org, Poul-Henning Kamp <phk@freebsd.org>, Alfred Perlstein <bright@mu.org> Subject: Re: Kernel stack size and stacking: do we have a problem ? Message-ID: <Pine.BSF.4.21.0112201244380.46573-100000@InterJet.elischer.org> In-Reply-To: <XFMail.011220124112.jhb@FreeBSD.org>
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On Thu, 20 Dec 2001, John Baldwin wrote: > > On 20-Dec-01 Julian Elischer wrote: > > basically yes, after N levels, switch to what netisr() does. > > then you get another N levels :-) The reason I hadn't checked it in is > > because I was thinking about whether it should be N levels or N bytes of > > stack used.... > > It should be based on how much stack room is left. yes that is what I was thinking.. curthread->kstack is the last valid location so it's actually very easy. But I wanted to actually 'drop' the packet if it went through a total of some maximum number of nodes allowed.. e.g. 64.. I can't imagine a practical application that requires a packet to go through 64 successive layers of en(de)capsulation.. :-) It may be worth keeping a counter AND doing the stack check. > > -- > > John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ > "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-arch" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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