I ran a test of my own devising, in which I wrote a trivial C program that calculates the square of a number using a quadratic algorithm, built it, and ran it under both the old and new kernels. Here are the results:
[2.6.35-28 kernel] chad@siga-asus:~/temp/testing$ time ./a.out 20000 The square of 20000, calculated very slowly, is 400000000 real 0m1.045s user 0m1.040s sys 0m0.000s [2.6.38-8 kernel] chad@siga-asus:~/temp/testing$ time ./a.out 20000 The square of 20000, calculated very slowly, is 400000000 real 0m53.264s user 0m49.130s sys 0m3.100s Since the "real" time is roughly the sum of "user" and "sys", this seems to be a confirmation that the CPU is the problem, rather than memory or I/O transfers. More interestingly, the "user" time dominating the "sys" time, which seems to indicate that it is not just system calls that are running at a glacial pace. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/793437 Title: Unusable Slowness In 2.6.38-8 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
