Date: Mon, 05 Mar 2001 19:33:54 -0800 From: housel@acm.org (Peter S. Housel) To: John Baldwin <jhb@FreeBSD.ORG> Cc: cvs-all@FreeBSD.ORG, cvs-committers@FreeBSD.ORG Subject: Re: cvs commit: src/sys/i386/isa apic_vector.s icu_vector.s Message-ID: <mu97l231sgt.wl@cx281057-a.irvn1.occa.home.com> In-Reply-To: <XFMail.010304204159.jhb@FreeBSD.org> References: <200103050437.f254bsP15616@freefall.freebsd.org> <XFMail.010304204159.jhb@FreeBSD.org>
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At Sun, 04 Mar 2001 20:41:59 -0800 (PST), John Baldwin wrote: > This fixed some hard hangs that David was seeing on his machine under heavy > load. It might also fix (or at lesat greatly diminish the number of > occurences) the "ltr" panics involving a kernel trap 9 with interrupts disabled. > By leaving interrupts disabled in sched_ithd, we don't allow ourselves to be > preempted by interrupt B while we are scheduling interrupt A. Otherwise, we > could become too deeply nested in our stack and overwrite various parts of the > pcb. (Some of which probably don't belong in the pcb.) Before this change, my Vaio C1VN would panic (trap 9 at the ltr instruction) after inserting a PCMCIA card. If the card was inserted during boot, it would panic just after the "pccard: card inserted, slot 0" message. Now it locks up solid in both cases. (No panic, and the DDB key doesn't work.) Cheers, -Peter- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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