DragonFly users List (threaded) for 2006-06
Re: High interrupt CPU usage in top
Mark Cullen <mark.r.cullen@xxxxxxxxx> wrote:
> I don't know if it is anything to be concerned about, but I seem to be
> seeing high interrupt CPU usage in top (at least) when compiling things...
> load averages: 0.81, 0.57, 0.36 up 0+00:37:49
> 43 processes: 2 running, 41 sleeping
> CPU states: 37.1% user, 0.0% nice, 27.9% system, 35.0% interrupt, 0.0% idle
Have you tried "vmstat -i"? It might give an indication
if any of the device interrupts is causing the problem.
I remember a similar problem on FreeBSD machines where the
USB interrupt was shared with the NIC interrupt. The USB
interrupt handler is quite heavy-weight, so it slowed down
the processing of NIC interrupts, even if no actual USB
devices were in use at all. Moving the USB controller to
a different interrupt (or disabling USB completely) solved
Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing
Dienstleistungen mit Schwerpunkt FreeBSD: http://www.secnetix.de/bsd
Any opinions expressed in this message may be personal to the author
and may not necessarily reflect the opinions of secnetix in any way.