Kernel people tell me users should never need to know the value of HZ used by the currently running kernel. One kernel hacker even told me that Linus once changed the value from 100 to 1000 just to see user space programs break. However, it is needed for the buffer parameter in TBF. The tc-tbf(8) manpage: If your buffer is too small, packets may be dropped because more tokens arrive per timer tick than fit in your bucket. The mini- mum buffer size can be calculated by dividing the rate by HZ. My kernel (2.6.12), for example, doesn't have a CONFIG option in /proc/config.gz. I only found out the correct HZ value by looking into /usr/include/asm/param.h, and even there are two values: 1000 for __KERNEL__ and 250 for the rest. Newer kernels have CONFIG options and 1000 is just one of the possible values. So, how do we reliably calculate the minimum value for buffer/burst/maxburts? _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
