From owner-freebsd-hackers Sun Aug 24 03:21:48 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id DAA25939 for hackers-outgoing; Sun, 24 Aug 1997 03:21:48 -0700 (PDT) Received: from dfw-ix12.ix.netcom.com (dfw-ix12.ix.netcom.com [206.214.98.12]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id DAA25934 for ; Sun, 24 Aug 1997 03:21:41 -0700 (PDT) Received: (from smap@localhost) by dfw-ix12.ix.netcom.com (8.8.4/8.8.4) id FAA03720 for ; Sun, 24 Aug 1997 05:21:08 -0500 (CDT) Received: from sjx-ca22-11.ix.netcom.com(204.30.65.107) by dfw-ix12.ix.netcom.com via smap (V1.3) id sma003711; Sun Aug 24 05:20:45 1997 Received: (from asami@localhost) by baloon.mimi.com (8.8.7/8.6.9) id DAA01323; Sun, 24 Aug 1997 03:20:41 -0700 (PDT) Date: Sun, 24 Aug 1997 03:20:41 -0700 (PDT) Message-Id: <199708241020.DAA01323@baloon.mimi.com> To: hackers@freebsd.org In-reply-to: <199708221807.LAA26407@phaeton.artisoft.com> (message from Terry Lambert on Fri, 22 Aug 1997 11:07:13 -0700 (MST)) Subject: Re: Final request for help with release. (DPT boot floppy) From: asami@cs.berkeley.edu (Satoshi Asami) Sender: owner-freebsd-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk * > I have also seen mysterious lockups (for a few seconds) with Solaris * > x86 when I bombarded more than two twin-channel controllers (Adaptec * > 3940W/UW) with lots of requests. FreeBSD had no problems whatsoever. * * This is probably a PCI issue. Most Intel PCI bridges do not * correctly arbitrate between more than two bus mastering PCI * devices simultaneously. That's what the Solaris x86 developer told us too. However, it is not a deadlock -- it is just a starvation of a few milliseconds, and should not cause the machine to lock up for a few seconds (and I mean a complete lockup, for instance the clock interrupts aren't delivered). I mentioned to him that the same test on identical hardware works fine under FreeBSD. I never heard back from him again. Satoshi