Date: Sun, 04 Oct 2009 16:53:36 +0200 (CEST) From: Alexander Best <alexbestms@math.uni-muenster.de> To: Hans Petter Selasky <hselasky@c2i.net>, Andrew Thompson <thompsa@freebsd.org> Cc: freebsd-usb@freebsd.org Subject: Re: mouse behaving strange on high cpu load and rapid movements Message-ID: <permail-20091004145336f7e55a9d00006880-a_best01@message-id.uni-muenster.de> In-Reply-To: <200910041635.24139.hselasky@c2i.net>
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Hans Petter Selasky schrieb am 2009-10-04:
> On Sunday 04 October 2009 14:44:34 Alexander Best wrote:
> > Hans Petter Selasky schrieb am 2009-10-01:
> > > On Wednesday 30 September 2009 15:23:18 Alexander Best wrote:
> > > > here's some debug output:
> > also i've notice that during heavy cpu load my keyboard's input
> > rate is
> > much lower than usual.
> > i'll try producing a few benchmark results when writing/reading to
> > a usb
> > stick under heavy cpu load to give you an idea about the slowdown
> > rate.
> Hi,
> If you look at the top of usb_process() in sys/dev/usb/usb_process.c,
> then you
> see there is some code to do priority settings. Recently something
> about the
> USB processes/threads was changed in USB regard, and I don't know if
> this
> might be the cause. Andrew, you might want to check if the priority
> settings
> in the USB code are still valid.
> I'm currently using the BSD scheduler, not ULE.
> --HPS
i did some more tests. first i attached a different mouse and in fact you were
right: the other mouse wasn't producing random copy&pastes during movements.
however the mouse was also behaving sloppy. so i think there is in fact a
priority problem somewhere. here are some SCHED/SMP tests i made:
SMP enabled + SCHED_ULE: sloppy mouse/keyboard
SMP disabled + SCHED_ULE: no problems
SMP enabled + SCHED_4BSD: no porblems
i did some bencmarking under SCHED_ULE + SMP enabled using the following
command `time dd if=/dev/zero of=/mnt/umass/test bs=1m count=100`. here are
the results:
without cpu intensive tasks running:
100+0 records in
100+0 records out
104857600 bytes transferred in 26.391317 secs (3973186 bytes/sec)
real 0m26.409s
user 0m0.000s
sys 0m1.385s
with cpu intensive tasks running:
100+0 records in
100+0 records out
104857600 bytes transferred in 41.911261 secs (2501896 bytes/sec)
real 0m42.748s
user 0m0.009s
sys 0m0.376s
i've also switched to the 4BSD scheduler and everything's fine now.
to produce heavy cpu load i compiled www/firefox35 and simultaniously ran this
app:
#include <stdio.h>
void tower(int n, int source, int target, int help) {
if (n >= 1) {
turm(n-1, source, help, target);
turm(n-1, help, target, source);
}
}
int main() {
tower(10000, 1, 3, 2);
}
cheers.
alex
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