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Date: Thu, 05 Apr 2007 09:19:27 +1000 From: Rusty Russell <rusty@...tcorp.com.au> To: Ingo Molnar <mingo@...e.hu> Cc: Anthony Liguori <aliguori@...ibm.com>, kvm-devel@...ts.sourceforge.net, netdev <netdev@...r.kernel.org> Subject: Re: [kvm-devel] QEMU PIC indirection patch for in-kernel APIC work On Wed, 2007-04-04 at 23:21 +0200, Ingo Molnar wrote: > * Anthony Liguori <aliguori@...ibm.com> 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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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