My kernel directory is 13GB, most of that is intermediate build products. Linus has written somewhere on how much faster kernel compilation is with an SSD.
My dual-SSD striped setup with humongous throughput (600MB/s) made a kernel compilation 1.4% faster compared to using a 5400rpm HD. But then I have 16GB RAM, and RAM is a huge bottleneck in its own right, as swapping or pushing out the file cache will kill compilation times.
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My kernel directory is 13GB, most of that is intermediate build products. Linus has written somewhere on how much faster kernel compilation is with an SSD.
My dual-SSD striped setup with humongous throughput (600MB/s) made a kernel compilation 1.4% faster compared to using a 5400rpm HD. But then I have 16GB RAM, and RAM is a huge bottleneck in its own right, as swapping or pushing out the file cache will kill compilation times.