3 ms·
QNX Lecture [pdf]
- whereistimbo 7y agoFrom: https://slashdot.org/comments.pl?sid=185194&cid=15285467 https://slashdot.org/comments.pl?sid=185194&cid=15285467 Within the size of L1 cache, your speed is determined by how quickly your cache will fill. Within L2, it's how effecient your algorithm is (do you invalidate too many cache lines?) -- smaller sections of kernel code are a win here, as much as good algorithms are a win here. Outside of L2 (anything over 512k on my Athlon64), throughput of common operations is limited by how fast the RAM is -- not IPC throughput. Most microkernel overhead is a constant value -- if your Linux kernel us O(n) or O(1), then it's possible to tune the microkernel to be O(n+k) or O(1+k) for the equivalent operations. The faster your hardware, the smaller this value of k since it's a constant value. L4Linux was 4-5% slower than "pure" Linux in 1997 (See L4Linux site for the PDF of the paper http://l4linux.org/ http://l4linux.org/).