[ovs-discuss] Some issues about datapath and userspace.

[zuo]

Thank you very much. I got it.


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At 2013-05-31 07:29:41,"Jesse Gross" <jesse at nicira.com> wrote:
>On Thu, May 30, 2013 at 10:31 AM, zuo <zuoqy at 163.com> wrote:
>> Thank you for providing the requested information.
>> I found that "subfacet->slow_path_reason == 0" indicates packets is
>> processed by fast path, so in this case the packet is directly forwarded by
>> the kernel. If it is in slow-path such as "slow_controller", the packets
>> will all be forwarded to userspace without buffering in kernel.  Do I
>> understand correctly?
>
>Yes, that's right.
>
>> Another question. I learned that flow miss to the controller will be
>> buffered in the userspace. If I send the entire packet to the controller
>> (not just the 128 bytes of pakcet header), is it still buffered in
>> userspace? Could I avoid for that?
>
>Yes, it is still buffered and no you can't change it.
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