spin lock panic in 5.2-REL
jhb at FreeBSD.org
Wed Jan 28 10:36:40 PST 2004
On Tuesday 27 January 2004 05:19 pm, Peter Losher wrote:
> On Tuesday 27 January 2004 10:34 am, John Baldwin wrote:
> > This is a very hard to debug problem. If WITNESS is on it provides more
> > useful information that can help track that down, but I wouldn't expect a
> > production machine to be using WITNESS.
> Yes, I was running a kernel for a short while w/ INVARIANTS and WITNESS,
> but it was basically useless after a couple of hours under load under the
> giant lock. How much of a performance hit is just WITNESS?
A lot. I think Robert Watson has seen as high a performance impact as 40%.
John Baldwin <jhb at FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
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