Messages in this thread | | | Date | Mon, 9 Aug 1999 22:30:07 -0400 | From | Wakko Warner <> | Subject | Re: SMP Scheduling |
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> I also have a dual CPU machine.
I have 2 dual cpu boxes. One is a dual pII 450, the other is a dual supersparc50. Both run 2.2.7 kernel and I see the pingpong effect when running distributed-net on the machines.
> Under 2.0 if you ran a CPU hog it'd pretty well stick to one CPU. > > I.e. if you had xosview running you'd see one CPU at 100%, the other mostly > idle. If there was a load burst, it might move to the other CPU, but that was > pretty unusual. > > Under 2.2 you see that one CPU hog hopping CPU's and at regular intervals. > Using xosview to track load what you see is a picket fence effect. > And there are more than "3 processes" running, more like 80 on my machine, > so running xosview alone shouldn't be enough to force this to happen and if > it were, the other processes should be introducing enough noise to make the > CPU swapping more erratic. > > This does seem to be "wrong", not so much that the process is changing CPU's, > thats reasonable, but the fact that it's doing it with such regularity now. > > I know this has been reported before, and plausible explanations have been > offered. However plausible isn't the same as "correct" and this does seem to > be a symptom of a real problem, or at least a real change in behaviour. > > > Peter > > ---------------------------------- > E-Mail: Peter Waltenberg <peterw@surf.dascom.com> > Date: 09-Aug-99 > Time: 08:45:38 > > This message was sent by XFMail > ---------------------------------- > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.rutgers.edu > Please read the FAQ at http://www.tux.org/lkml/ -- Lab tests show that use of micro$oft causes cancer in lab animals
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