/proc/cpuinfo "cache" category: L1, L2 or total?

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http://unix.stackexchange.com – When I look in /proc/cpuinfo, one of the lines tells me I have 6144 KB of cache. Is this L1 cache, L2 cache, or the sum of both of them? In any case, how do I find out how much L1 and L2 cache my system has? (HowTos)