Hybrid kernel, not NT

By: nick (anon.delete@this.anon.com), May 13, 2006 7:41 pm
Room: Moderated Discussions
Brendan (btrotter@gmail.com) on 5/13/06 wrote:
---------------------------
>Hi,
>
>nick (anon@anon.com) on 5/13/06 wrote:

>>Great now your scalability sucks, and you can do this with
>>a monolithic kernel anyway as Linus points out.
>
>The message queues are only locked when messages are being added or removed. I
>guess it does depend on how the messaging is done - synchronous messaging would probably suck for scalability.

No, it would suck. You're about 10 years behind: lock
contention doesn't hurt scalability any more, cacheline
contention does.

>>>Also, a micro-kernel is often small enough that the equivelent of a "big kernel
>>>lock" is practical, meaning you could have one lock in the entire system in addition
>>>to any "processes specific" locks, and no other locks.
>>
>>I don't know what systems that thing would run on, but it
>>wouldn't be any big ones, that's for sure.
>
>That depends what the OS is designed for and how fast the slowest kernel function is.

The microkernel handles scheduler, interrupts, IPC, and
queueing messages to servers? And it has a big kernel lock?
Then scalability sucks, full stop.

>
>>>Another potential advantage is NUMA systems, where you can set the CPU affinity
>>>on a device driver so that it's always run on a CPU that is "close" to the I/O controller
>>>used by the device. This doesn't apply to things like
>>
>>No, this is not. Because if the data is coming from / going
>>to somewhere off node, you must send it across nodes anyway.
>>And now you *also* have control information (messages) going
>>across nodes as well.
>
>For control information you've got a choice - access the control data across nodes,
>or access the device driver code and it's local state across nodes. Unless everything
>(control data, code and state) is on the same node it can't be "perfect" regardless
>of what you do (for all kernel designs).

That isn't a choice, that is a restriction!
< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
Hybrid (micro)kernelsTzvetan Mikov2006/05/08 04:41 PM
  Hybrid (micro)kernelsS. Rao2006/05/08 06:14 PM
  Hybrid (micro)kernelsBill Todd2006/05/08 06:16 PM
    Hybrid (micro)kernelsTzvetan Mikov2006/05/08 07:21 PM
      Hybrid (micro)kernelsnick2006/05/08 07:50 PM
      Hybrid (micro)kernelsBill Todd2006/05/09 01:26 AM
        There aren't enough words...Rob Thorpe2006/05/09 02:39 AM
          There aren't enough words...Tzvetan Mikov2006/05/09 03:10 PM
            There aren't enough words...Rob Thorpe2006/05/15 12:25 AM
        Hybrid (micro)kernelsTzvetan Mikov2006/05/09 11:17 AM
          Hybrid (micro)kernelsBill Todd2006/05/09 04:05 PM
  Hybrid (micro)kernelsrwessel2006/05/08 11:23 PM
    Hybrid kernel, not NTRichard Urich2006/05/09 06:03 AM
      Hybrid kernel, not NT_Arthur2006/05/09 07:06 AM
        Hybrid kernel, not NTRob Thorpe2006/05/09 07:40 AM
          Hybrid kernel, not NT_Arthur2006/05/09 08:30 AM
            Hybrid kernel, not NTRob Thorpe2006/05/09 09:07 AM
              Hybrid kernel, not NT_Arthur2006/05/09 09:36 AM
                Linux vs MacOSX peformance, debunked_Arthur2006/05/18 07:30 AM
                  Linux vs MacOSX peformance, debunkedRob Thorpe2006/05/18 08:19 AM
                    Linux vs MacOSX peformance, debunkedAnonymous2006/05/18 12:31 PM
        Hybrid kernel, not NTLinus Torvalds2006/05/09 08:16 AM
          Hybrid kernel, not NTAndi Kleen2006/05/09 02:32 PM
            Hybrid kernel, not NTmyself2006/05/09 03:24 PM
              Hybrid kernel, not NTmyself2006/05/09 03:41 PM
              Hybrid kernel, not NTBrendan2006/05/09 05:26 PM
                Hybrid kernel, not NTLinus Torvalds2006/05/09 08:06 PM
                  Hybrid kernel, not NTBrendan2006/05/13 01:35 AM
                    Hybrid kernel, not NTnick2006/05/13 04:40 AM
                      Hybrid kernel, not NTBrendan2006/05/13 09:48 AM
                        Hybrid kernel, not NTnick2006/05/13 07:41 PM
                          Hybrid kernel, not NTBrendan2006/05/13 09:51 PM
                            Hybrid kernel, not NTnick2006/05/14 05:57 PM
                              Hybrid kernel, not NTBrendan2006/05/14 10:40 PM
                                Hybrid kernel, not NTnick2006/05/14 11:46 PM
                                  Hybrid kernel, not NTBrendan2006/05/15 04:00 AM
                                    Hybrid kernel, not NTrwessel2006/05/15 07:21 AM
                                      Hybrid kernel, not NTBrendan2006/05/15 08:55 AM
                                        Hybrid kernel, not NTLinus Torvalds2006/05/15 09:49 AM
                                          Hybrid kernel, not NTnick2006/05/15 04:41 PM
                                          Hybrid kernel, not NTtony roth2008/01/31 02:20 PM
                                    Hybrid kernel, not NTnick2006/05/15 06:33 PM
                                      Hybrid kernel, not NTBrendan2006/05/16 01:39 AM
                                        Hybrid kernel, not NTnick2006/05/16 02:53 AM
                                          Hybrid kernel, not NTBrendan2006/05/16 05:37 AM
                  Hybrid kernel, not NTAnonymous2008/05/01 10:31 PM
                    Following the structure of the treeMichael S2008/05/02 04:19 AM
                      Following the structure of the treeDean Kent2008/05/02 05:31 AM
                        Following the structure of the treeMichael S2008/05/02 06:02 AM
                        Following the structure of the treeDavid W. Hess2008/05/02 06:48 AM
                          Following the structure of the treeDean Kent2008/05/02 09:14 AM
                            Following the structure of the treeDavid W. Hess2008/05/02 10:05 AM
                              LOL!Dean Kent2008/05/02 10:33 AM
                              Following the structure of the treeanonymous2008/05/02 03:04 PM
                                Following the structure of the treeDean Kent2008/05/02 07:52 PM
                                Following the structure of the treeFoo_2008/05/03 02:01 AM
                                  Following the structure of the treeDavid W. Hess2008/05/03 06:54 AM
                                    Following the structure of the treeDean Kent2008/05/03 10:06 AM
                                      Following the structure of the treeFoo_2008/05/04 01:06 AM
                                        Following the structure of the treeMichael S2008/05/04 01:22 AM
            Hybrid kernel, not NTLinus Torvalds2006/05/09 05:19 PM
              Microkernel Vs Monolithic KernelKernel_Protector2006/05/09 09:41 PM
                Microkernel Vs Monolithic KernelDavid Kanter2006/05/09 10:30 PM
                  Sigh, Stand back, its slashdotting time. (NT)Anonymous2006/05/09 10:44 PM
                  Microkernel Vs Monolithic Kernelblah2006/05/12 08:58 PM
                  Microkernel Vs Monolithic KernelRob Thorpe2006/05/15 01:41 AM
          Hybrid kernel, not NTAnalGuy2006/05/16 03:10 AM
            Theory versus practiceDavid Kanter2006/05/16 12:55 PM
              Distributed algorithmsRob Thorpe2006/05/17 12:53 AM
              Theory versus practiceHoward Chu2006/05/17 02:54 AM
                Theory versus practiceJS2006/05/17 04:29 AM
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  Hybrid (micro)kernelsphilt2006/05/14 09:15 PM
    Hybrid (micro)kernelsLinus Torvalds2006/05/15 08:20 AM
      Hybrid (micro)kernelsLinus Torvalds2006/05/15 11:56 AM
        Hybrid (micro)kernelsRob Thorpe2006/05/16 01:22 AM
          Hybrid (micro)kernelsrwessel2006/05/16 11:23 AM
            Hybrid (micro)kernelsRob Thorpe2006/05/17 12:43 AM
              Hybrid (micro)kernelsrwessel2006/05/17 01:33 AM
                Hybrid (micro)kernelsRob Thorpe2006/05/19 07:51 AM
                  Hybrid (micro)kernelsrwessel2006/05/19 12:27 PM
      Hybrid (micro)kernelstechIperson2006/05/15 01:25 PM
      Hybrid (micro)kernelsmas2006/05/15 05:17 PM
        Hybrid (micro)kernelsLinus Torvalds2006/05/15 05:39 PM
          Hybrid (micro)kernelsColonel Kernel2006/05/15 09:17 PM
            Hybrid (micro)kernelsWink Saville2006/05/15 10:31 PM
              Hybrid (micro)kernelsLinus Torvalds2006/05/16 10:08 AM
                Hybrid (micro)kernelsWink Saville2006/05/16 09:55 PM
          Hybrid (micro)kernelsrwessel2006/05/16 11:31 AM
            Hybrid (micro)kernelsLinus Torvalds2006/05/16 12:00 PM
        Hybrid (micro)kernelsBrendan2006/05/16 01:36 AM
        Hybrid (micro)kernelsPaul Elliott2006/09/03 08:44 AM
          Hybrid (micro)kernelsRob Thorpe2006/09/04 09:25 AM
      Hybrid (micro)kernelsphilt2006/05/16 12:55 AM
        Hybrid (micro)kernelspgerassi2007/08/16 07:41 PM
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  Hybrid (micro)kernelsisrael2006/05/20 04:25 AM
    Hybrid (micro)kernelsRob Thorpe2006/05/22 08:35 AM
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