Re: Why not use GCC 3.0?

[Michael Lake <mikel@speleonics.com.au>]

Falk Hueffner wrote:
> It depends on their amount. I'd estimate an unaligned trap takes about
> 100 cycles to handle. So if for example on my SX, I get 1000 unaligned
> traps per second, I loose about 0.1% of the performance. You can check
> the amount of unaligned traps by watching /proc/cpuinfo.

I have often seen these 'unaligned traps' lurking in my logs so I am curious about being able too see how many occur in cpuinfo and learning something
new about my Alpha. 
Looking at my cpuinfo I see....
	kernel unaligned acc	: 0 (pc=0,va=0)
	user unaligned acc	: 5407 (pc=120009bbc,va=1201c1abc)
	platform string		: Digital AlphaPC 164LX 533 MHz

Is "acc" short for access? I gather the unaligned trap is where the kernal detects and traps a memory access. Whats the number of unaligned traps, the
zero number in kernal unaligned acc or the 5407? I presume that my cpuinfo is telling me that whatever causes these unaligned traps is something that
runs from user space?

Mike
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Michael Lake
Active caver, Linux enthusiast and interested in anything technical.
Safety Convenor, Australian Speleological Federation
Owner, Speleonics (Australia)
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