From owner-freebsd-bugs Sun May 3 11:58:55 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id LAA06572 for freebsd-bugs-outgoing; Sun, 3 May 1998 11:58:55 -0700 (PDT) (envelope-from owner-freebsd-bugs@FreeBSD.ORG) Received: from ns.mt.sri.com (sri-gw.MT.net [206.127.105.141]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id LAA06567 for ; Sun, 3 May 1998 11:58:51 -0700 (PDT) (envelope-from nate@mt.sri.com) Received: from mt.sri.com (rocky.mt.sri.com [206.127.76.100]) by ns.mt.sri.com (8.8.8/8.8.8) with SMTP id MAA26073; Sun, 3 May 1998 12:58:28 -0600 (MDT) (envelope-from nate@rocky.mt.sri.com) Received: by mt.sri.com (SMI-8.6/SMI-SVR4) id MAA20839; Sun, 3 May 1998 12:58:27 -0600 Date: Sun, 3 May 1998 12:58:27 -0600 Message-Id: <199805031858.MAA20839@mt.sri.com> From: Nate Williams MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit To: Poul-Henning Kamp Cc: John Hay , freebsd-bugs@FreeBSD.ORG Subject: Re: i386/5398 In-Reply-To: <11869.894218238@critter.freebsd.dk> References: <199805031749.TAA07478@zibbi.mikom.csir.co.za> <11869.894218238@critter.freebsd.dk> X-Mailer: VM 6.29 under 19.15 XEmacs Lucid Sender: owner-freebsd-bugs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > >Just to get my understanding of the hardware a little better. Is this > >blitting just doing something like a software memory copy, like what > >the C function bcopy() does? And can that really block interrupts just > >because it is done over the PCI bus? Or does blitting use something > >different? > > I don't know how it is done exactly, check with XFree86. I just know > that any PCI bus hogging will send your interrupt latency soaring :-( ps. It's not just PCI bus hogging, since I've got an ISA box that also sees the same thing. As a matter of fact, I'm pretty sure it's completely unrelated to any particular bus architecture. Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message