Messages in this thread | | | From | "Mike Galbraith" <> | Subject | Re: 2.5.47 scheduler problems? | Date | Mon, 18 Nov 2002 08:29:57 +0100 |
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----- Original Message ----- From: "Tim Connors" <tconnors@astro.swin.edu.au> To: <linux-kernel@vger.kernel.org>; "Mike Galbraith" <efault@gmx.de> Sent: Monday, November 18, 2002 7:51 AM Subject: Re: 2.5.47 scheduler problems?
> In linux.kernel, you wrote: > > Greetings, > > > > For testing swap throughput, I like to run make -j30 bzImage on my 500Mhz > > PIII w. 128Mb ram. For testing interactivity, I fire up KDE, start a > > smaller make -j, grab a window, and wave it around. > > > > With 2.4.20rc2+rc1aa1, running a -j10 build (not swapping) is very very > > bad. However, if I set all tasks in the system to SCHED_FIFO or SCHED_RR > > prior to this light make -j, I have a ~pretty smooth system. > > > > If I do the same in 2.5.47, I have no control of my box. Setting all tasks > > to SCHED_FIFO or SCHED_RR prior to starting make -j10 bzImage, I can regain > > control, but interactivity under load is basically not present. > > Funny that. > > > I used to be able to wave a window poorly at make -j25 (swapping heftily), > > fairly smoothly at make -j20, and smoothly at make -j15 or below. This > > with no SCHED_RR/SCHED_FIFO. (I haven't done much testing like this in > > quite a while though) > > Perhaps you should consider buying an extra 29 CPU's for you desktop?
I have neither the need for 30 CPUs, nor the cash to pay for such a beast :)
I gather you think my test is silly?
-Mike
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