On Tue, 28 Oct 2008 12:21:32 +0100 Ivan Voras <[EMAIL PROTECTED]> wrote:
> Oleksandr Samoylyk wrote: > > Ivan Voras wrote: > >> Bartosz Giza wrote: > >> > >>> Another question is why em0 taskq is eating so much cpu ? BGE > >>> interface is actually one that pushes 2 times more packets than > >>> em0 and it uses about half cpu comparing to em0. Is that not > >>> strange ? Could someone tell my why is this happening ? BGE is > >>> faster ? or maybe i can tune some > >> > >> I have the same problem - em0 taskq eating incredible amounts of > >> CPU. If you find a solution, contact me! > >> > >> > > > > It could be not just a problem with em driver. > > Firstly, it's good to make profiling and find out what exactly eats > > CPU > > Can you give any pointers on how to profile the driver and/or the > network stack? > From what I remember from a couple of years ago you can use hwpmc in system mode to profile the kernel if you have a supported CPU - I certainly remember seeing the output of gprof tell me the UDP checksum function was taking most of the time in a test I ran. To get started you need options HWPMC_HOOKS and device hwpmc in your kernel config (hwpmc can also be a module) - then you run pmcstat to run the test. There's lots more information at http://wiki.freebsd.org/PmcTools -- Bruce Cran _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
