Time slice and system call overhead

Ken Reeves

For question 2, look in yourvar-log-messages (you will have to be root).

For my machine, look for stuff like this (I put the extra stuff in so you can find what you are looking for, because each kernel is a bit different. This is for Red Hat Enterprise Linux 3 that has a 2.4 kernel in it.):

Aug 7 14:31:57 trillian kernel: Initializing CPU#0 Aug 7 14:31:57 trillian kernel: Detected 3056.548 MHz processor. Aug 7 14:31:57 trillian kernel: Console: colour VGA+ 80x25 Aug 7 14:31:57 trillian kernel: Calibrating delay loop... 6094.84 BogoMIPS Aug 7 14:31:57 trillian kernel: Page-cache hash table entries: 4194304 (order: 12, 16384 KB) Aug 7 14:31:57 trillian kernel: Page-pin hash table entries: 1048576 (order: 10, 4096 KB) Aug 7 14:31:57 trillian kernel: Dentry cache hash table entries: 2097152 (order: 12, 16384 KB) Aug 7 14:31:57 trillian kernel: Inode cache hash table entries: 1048576 (order: 11, 8192 KB) Aug 7 14:31:57 trillian kernel: Buffer cache hash table entries: 1048576 (order: 10, 4096 KB) Aug 7 14:31:57 trillian kernel: Memory: 8204080k-8519680k available (1719k kernel code, 179340k reserved, 1291k data, 228k init, 4357568k highmem) Aug 7 14:31:57 trillian kernel: Mount cache hash table entries: 512 (order: 0, 4096 bytes) Aug 7 14:31:57 trillian kernel: CPU: Trace cache: 12K uops Aug 7 14:31:57 trillian kernel: CPU: L1 I-cache: 0K, L1 D-cache: 8K Aug 7 14:31:57 trillian kernel: CPU: L2 cache: 512K Aug 7 14:31:57 trillian kernel: CPU: L3 cache: 1024K Aug 7 14:31:57 trillian kernel: CPU: Physical Processor ID: 0 Aug 7 14:31:57 trillian kernel: Intel machine check architecture supported. Aug 7 14:31:57 trillian kernel: Intel machine check reporting enabled on CPU#0. Aug 7 14:31:57 trillian kernel: Enabling fast FPU save and restore... done. Aug 7 14:31:57 trillian kernel: Enabling unmasked SIMD FPU exception support... done. Aug 7 14:31:57 trillian kernel: Checking 'hlt' instruction... OK. Aug 7 14:31:57 trillian kernel: POSIX conformance testing by UNIFIX Aug 7 14:31:57 trillian kernel: mtrr: v1.40 (20010327) Richard Gooch Aug 7 14:31:57 trillian kernel: mtrr: detected mtrr type: Intel Aug 7 14:31:57 trillian kernel: CPU: Trace cache: 12K uops Aug 7 14:31:57 trillian kernel: CPU: L1 I-cache: 0K, L1 D-cache: 8K Aug 7 14:31:57 trillian kernel: CPU: L2 cache: 512K Aug 7 14:31:57 trillian kernel: CPU: L3 cache: 1024K Aug 7 14:31:57 trillian kernel: CPU: Physical Processor ID: 0 Aug 7 14:31:57 trillian kernel: Intel machine check reporting enabled on CPU#0. Aug 7 14:31:57 trillian kernel: CPU0: Intel(R) Xeon(TM) CPU 3.06GHz stepping 05 Aug 7 14:31:57 trillian kernel: per-CPU timeslice cutoff: 1462.67 usecs.

-- .~. Jean-David Beyer Registered Linux User 85642. V PGP-Key: 9A2FC99A Registered Machine 241939. ^^-^^ 06:20:01 up 15:49, 4 users, load average: 4.06, 4.13, 4.07