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I added more secondary cache to the system but I didn't see any improvement in performance
Explanation:You were told that adding more secondary (level 2) cache to the system would improve performance, but don't see it. The system seems the same as it did before.
Diagnosis: The truth is that especially if you already have 256 KB of cache, adding another 256 KB does not significantly impact on performance. The reason is that the original cache is already probably catching over 90% of memory requests, so there just isn't that much room for improvement. A 5% improvement in overall performance is typical for a desktop user, and increases in speed of less than 10% are hard for most people to notice. Of course, this all assumes that your upgrade was performed correctly, and actually "took".