Date: Fri, 8 Sep 2000 09:52:54 +0930 From: Greg Lehey <grog@lemis.com> To: Chuck Paterson <cp@bsdi.com> Cc: Warner Losh <imp@village.org>, The Hermit Hacker <scrappy@hub.org>, freebsd-current@FreeBSD.ORG, freebsd-smp@FreeBSD.ORG Subject: Re: 'interrupt-level buffer overflows' for sio device? Message-ID: <20000908095254.E83632@wantadilla.lemis.com> In-Reply-To: <200009072300.RAA24702@berserker.bsdi.com>; from cp@bsdi.com on Thu, Sep 07, 2000 at 05:00:15PM -0600 References: <200009072300.RAA24702@berserker.bsdi.com>
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On Thursday, 7 September 2000 at 17:00:15 -0600, Chuck Paterson wrote: > FYI, this is very likely not caused by the heavy weight > interrupt threads, but rather because the interrupt threads can't > be run because the giant lock is held by a process running in the > kernel. Once we get drivers to have their own locking and pulled out > from under the giant lock this problem should deminish greatly. Before > we can do this there are various infrastructure pieces which must > be made mp safe, such as the lockmanger. We're running sio as a fast interrupt, so it's definitely not because of a heavyweight thread :-) I think fast interrupts also completely bypass mutexes, though something might have changed since I last looked. Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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