Date: Thu, 15 Jul 2004 22:18:11 -0500 From: Jon Noack <noackjr@alumni.rice.edu> To: Sean McNeil <sean@mcneil.com> Cc: freebsd-current@freebsd.org Subject: Re: consistent hard lockup with recent kernels Message-ID: <40F748F3.6020702@alumni.rice.edu> In-Reply-To: <1089924060.1074.7.camel@server.mcneil.com> References: <1089924060.1074.7.camel@server.mcneil.com>
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On 07/15/04 15:41, Sean McNeil wrote: > I get a very repeatable hard freeze of the system when I use firefox and > attempt to download a large iso image. I've been trying to get a livecd > image from a gentoo.org mirror (needed for something else, I'm a FreeBSD > fan, honest!!) ;) > > I suppose this is related to the preemption issues, but don't have > anything to show for it except my dmegs. I can't access the system at > all to see why it is happening. Yeah, it is most likely bugs uncovered by native preemption. For now you can remask then by commenting out the "#define PREEMPTION" in src/sys/<ARCH>/include/param.h and rebuilding your kernel. Robert Watson's comments on this: "This results in a quite usable kernel, although quite probably more poor interrupt handling latency, etc." You'll see the following warning on boot: WARNING: Kernel preemption is disabled, expect reduced performance. An example of this reduced performance is sound issues (slowdowns, pops, etc.) when the system is under load (most notably with disk load). Jon
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