> So its the DISK I/O thats causing loss of ticks ? My first Red Hat system defaulted to no-DMA for IDE disks. (Yes, that was a long time ago.) With that setup, it was simple to generate lots of lost timer interrupts: just keep the disk busy doing reads. (Seeks don't count. Read consecutive sectors.)
My problem went away when I turned on DMA. I have a hack that I originally wrote for measuring disk transfer rates. I'll dust it off and put it on the wiki if people think it will be helpful for discussions like this. It compiles on Linux. It should be easy to get it to work on other *nix systems. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
