Re: LuaJit 1.1.0 coredump on FreeBSD
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- Subject: Re: LuaJit 1.1.0 coredump on FreeBSD
- From: Jim Mellander <jmellander@...>
- Date: 2006年3月29日 11:01:20 -0800
Hi Mike:
Thanks for your quick response. It indeed looks like SSE is not enabled
in the kernel per:
$ sysctl hw.instruction_sse
hw.instruction_sse: 0
However, this is a production kernel, for which any changes need to go
thru a time-consuming QA process, as well as requiring me to run the
gauntlet of fascist system administration :-( Under the circumstances,
I would prefer to take the performance hit by sinking back into the
pre-SSE days. I didn't see any option for disabling the use of SSE in
the Luajit code - can this be done via a define? Alternatively, is
there some way to detect that although the CPU supports SSE, the kernel
doesn't, and dynamically disable that code under the circumstances?
Thanks in advance.
Mike Pall wrote:
Hi,
Jim Mellander wrote:
I've been using Luajit 1.0.3 for my application with no problems on
FreeBSD 4.10
I built LuaJIT 1.1.0 ('make bsd') on the same system, and get the
following problem:
[...]
Illegal instruction (core dumped)
This looks like a problem with SSE2 code generation. It seems
your kernel doesn't know how to deal with it even though your CPU
supports it?
I don't have access to a system with such an old version of
FreeBSD. But a little research shows that SSE support must be
explicitly enabled for 4.x with 'options CPU_ENABLE_SSE'. If your
kernel doesn't have this, then you need to recompile it with this
option.
Bye,
Mike
--
Jim Mellander
Incident Response Manager
Computer Protection Program
Lawrence Berkeley National Laboratory
(510) 486-7204
Your fortune for today is:
Let us never negotiate out of fear, but let us never fear to negotiate.
-- John F. Kennedy