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/ "Power Users Use the Power to Serve" = http://www.FreeBSD.orgReceived on Wed Jan 28 2004 - 09:36:40 UTC
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