Re: Network slowdown due to CFS

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To: <davids@...>
Cc: Ingo Molnar <mingo@...>, <linux-kernel@...>
Date: Wednesday, October 3, 2007 - 7:31 am

David Schwartz wrote:
How about:
Check the lock. If it is held, sleep for an interval that is shorter
than acceptable waiting time. If it is still held, sleep for twice as long.
Loop until you get the lock and do the work, or until you
you reach the limit for how much you can wait at this point and
dispatch to a thread instead.

This approach should be portable, don't wake up too often,
and don't waste the CPU.  (And it won't go idle either, whoever
holds the lock will be running.)


Helge Hafting
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Messages in current thread:
Network slowdown due to CFS, Martin Michlmayr, (Wed Sep 26, 4:52 am)
Re: Network slowdown due to CFS, Mike Galbraith, (Wed Sep 26, 6:23 am)
Re: Network slowdown due to CFS, Martin Michlmayr, (Wed Sep 26, 6:48 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Sep 26, 7:21 am)
Re: Network slowdown due to CFS, Martin Michlmayr, (Wed Sep 26, 7:29 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Thu Sep 27, 5:49 am)
Re: Network slowdown due to CFS, Martin Michlmayr, (Thu Sep 27, 6:54 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Thu Sep 27, 6:56 am)
Re: Network slowdown due to CFS, Martin Michlmayr, (Thu Sep 27, 7:12 am)
RE: Network slowdown due to CFS, David Schwartz, (Wed Sep 26, 8:00 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Sep 26, 9:31 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Thu Sep 27, 5:30 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Thu Sep 27, 5:46 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Thu Sep 27, 8:27 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Thu Sep 27, 9:31 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Thu Sep 27, 10:42 am)
Re: Network slowdown due to CFS, Nick Piggin, (Fri Sep 28, 2:10 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Mon Oct 1, 4:43 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Tue Oct 2, 5:26 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Mon Oct 1, 12:25 pm)
Re: Network slowdown due to CFS, Jarek Poplawski, (Tue Oct 2, 5:03 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Tue Oct 2, 9:39 am)
Re: Network slowdown due to CFS, Chris Friesen, (Mon Oct 1, 12:55 pm)
Re: Network slowdown due to CFS, Ingo Molnar, (Mon Oct 1, 1:09 pm)
Re: Network slowdown due to CFS, Chris Friesen, (Mon Oct 1, 1:45 pm)
Re: iperf yield usage, Ingo Molnar, (Mon Oct 1, 3:09 pm)
RE: Network slowdown due to CFS, David Schwartz, (Mon Oct 1, 12:49 pm)
RE: Network slowdown due to CFS, Rusty Russell, (Wed Oct 3, 8:31 pm)
Re: Network slowdown due to CFS, Helge Hafting, (Wed Oct 3, 7:31 am)
Re: Network slowdown due to CFS, Arjan van de Ven, (Mon Oct 1, 3:53 pm)
RE: Network slowdown due to CFS, David Schwartz, (Mon Oct 1, 6:17 pm)
Re: Network slowdown due to CFS, Arjan van de Ven, (Mon Oct 1, 6:35 pm)
RE: Network slowdown due to CFS, David Schwartz, (Mon Oct 1, 6:44 pm)
Re: Network slowdown due to CFS, Arjan van de Ven, (Mon Oct 1, 6:55 pm)
RE: Network slowdown due to CFS, David Schwartz, (Tue Oct 2, 11:37 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 3:15 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Mon Oct 1, 1:31 pm)
RE: Network slowdown due to CFS, David Schwartz, (Mon Oct 1, 2:23 pm)
Re: yield API, Ingo Molnar, (Tue Oct 2, 2:46 am)
Re: yield API, Jesper Juhl, (Wed Dec 12, 6:39 pm)
Re: yield API, Kyle Moffett, (Thu Dec 13, 12:43 am)
RE: yield API, David Schwartz, (Thu Dec 13, 4:10 pm)
Re: yield API, Eric St-Laurent, (Tue Oct 2, 5:57 pm)
Re: yield API, linux-os (Dick Johnson), (Tue Oct 2, 7:50 am)
Re: yield API, Douglas McNaught, (Tue Oct 2, 11:24 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Tue Oct 2, 2:26 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Tue Oct 2, 2:08 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Tue Oct 2, 2:06 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 4:02 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Oct 3, 4:16 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 4:56 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Oct 3, 5:10 am)
Re: Network slowdown due to CFS, Casey Dahlin, (Thu Oct 4, 1:33 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 5:50 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Sun Oct 7, 3:18 am)
Re: Network slowdown due to CFS, Dmitry Adamushko, (Wed Oct 3, 6:55 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 7:40 am)
Re: yield, Ingo Molnar, (Wed Oct 3, 7:56 am)
Re: yield, Jarek Poplawski, (Wed Oct 3, 8:16 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Oct 3, 7:22 am)
Re: Network slowdown due to CFS, Dmitry Adamushko, (Wed Oct 3, 6:58 am)
Re: Network slowdown due to CFS, Jarek Poplawski, (Wed Oct 3, 7:20 am)
Re: Network slowdown due to CFS, Andi Kleen, (Tue Oct 2, 2:47 am)
Re: Network slowdown due to CFS, Stephen Hemminger, (Wed Sep 26, 11:46 am)
Re: Network slowdown due to CFS, Stephen Hemminger, (Wed Sep 26, 11:40 am)
Re: Network slowdown due to CFS, Mike Galbraith, (Wed Sep 26, 6:20 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Sep 26, 5:34 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Sep 26, 5:47 am)
Re: Network slowdown due to CFS, Martin Michlmayr, (Wed Sep 26, 6:08 am)
Re: Network slowdown due to CFS, Ingo Molnar, (Wed Sep 26, 6:18 am)