Messages in this thread |  | | | From | "Mike Galbraith" <> | | Subject | Re: 2.5.47 scheduler problems? | | Date | Mon, 18 Nov 2002 08:35:56 +0100 |
----- Original Message ----- From: "Andrew Morton" <akpm@digeo.com> To: "Tim Connors" <tconnors@astro.swin.edu.au> Cc: <linux-kernel@vger.kernel.org>; "Mike Galbraith" <efault@gmx.de> Sent: Monday, November 18, 2002 8:08 AM Subject: Re: 2.5.47 scheduler problems?
> Tim Connors wrote: > > > > > 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? > > > > No. He's saying that it used to be OK, but it has got worse. > > A much simpler test is to start a big compilation and then madly > waggle an X window around. Goes OK for a few seconds, and then > seizes up quite horridly. Presumably because the scheduler has > suddenly decided that the X server has become a "batch" process > and is scheduling it in a similar manner to the compilation. > > If you stop wiggling the window for 5-10 seconds it comes back. > Presumably because the scheduler has decided that the X server is > "interactive" again. > > When it happens, it's *very* bad. The mouse cursor doesn't move > for 0.5-1.0 seconds and then takes great leaps. It is unusable.
I was watching it this morning, without wiggling, and it seems to update window content (make output in one and vmstat in another) about every 5 seconds.. very odd looking.
-Mike
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