All: More than anything what I wanted was a justification for why things were; not sure why you took that as complaining Theo. At the same time Theo, Claudio your last replies have been very informative as far as the bugs hw offloading introduces etc etc and the reasoning. Thanks all!
-- Adonis > On Jul 21, 2018, at 3:59 PM, Theo de Raadt <dera...@openbsd.org> wrote: > > Claudio Jeker <cje...@diehard.n-r-g.com> wrote: > >>> On Sat, Jul 21, 2018 at 07:02:08PM +0000, Stuart Henderson wrote: >>>> On 2018-07-21, Adonis Peralta <doni...@gmail.com> wrote: >>>> Is there a reason why the offloading features shouldn???t work correctly >>>> on OpenBSD? >>> >>> If you can figure out why it doesn't work, you'll be well on the way to >>> fixing it. >>> >>>> i350 supports offloading just fine via the igb driver on FreeBSD. Is >>>> it more work on the driver thats needed? >>> >>> Different OS, different driver.. >>> >>> No idea if it's the case with i350 too, but checksum offload has been >>> rather underwhelming when supported on some other NICs. >> >> We had to turn of many of the HW features used by other OS becuase of HW >> bugs. em(4) is not an exception. Lately it has become more obvious that >> most of those offload features are either bad for you or the gain does not >> really justify the effort. The amount of bugs we hit because of such >> features are countless. NFS and multicast packets are just two things to >> mention which broke on Intel cards when enabling some of the offloading >> features. I lost interest in offloading since CPUs are now fast enough. > > My favorite hw offloading bug was in the Tehuti 10G ethernet, which > would perform ipv4 checksumming against non-ipv4 packets. Fantastic > fun. > > When hardware has a feature, it doesn't mean require you to use it. You > need to JUSTIFY the need. Just recently, we failed to support the intel > debug registers, we hadn't felt the yearning to support a feature other > architectures don't have an exact similar feature for. As a result > everyone else had the pop ss bug, but we avoided it. > > It's science. So Adonis, steps for you are: 1) Stop complaining. > 2) JUSTIFY the need. 3) Do the work. End of story. >
