On Wed, 2007-04-04 at 23:21 +0200, Ingo Molnar wrote: > * Anthony Liguori <[EMAIL PROTECTED]> wrote: > > > But why is it a good thing to do PV drivers in the kernel? You lose > > flexibility and functionality to gain performance. [...] > > in Linux a kernel-space network driver can still be tunneled over > user-space code, and hence you can add arbitrary add-on functionality > (and thus have flexibility), without slowing down the common case (which > would be to tunnel the guest's network traffic into the firewall rules > of the kernel. No need to touch user-space for any of that).
You didn't quote Anthony's point about "it's more about there not being good enough userspace interfaces to do network IO." It's easier to write a kernel-space network driver, but it's not obviously the right thing to do until we can show that an efficient packet-level userspace interface isn't possible. I don't think that's been done, and it would be interesting to try. Cheers, Rusty. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
