Date: Tue, 23 Oct 2001 01:34:14 +0200 From: "Alex (DDS)" <akruijff@dds.nl> To: David Kirchner <davidk@accretivetg.com> Cc: questions@FreeBSD.ORG Subject: Re: CPU interrupted problem Message-ID: <3BD4ACF6.6060800@dds.nl> References: <20011022111009.U85958-100000@localhost>
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David Kirchner wrote:
> On Mon, 22 Oct 2001, Alex (DDS) wrote:
>>
>>I have a problem with the interrupt level of my cpu. Over 50% is at
>>normal operation used for interrupt. If i become root with the su
>>command then the 50% strangely disappears for a couple of minutes and
>>then it comes back again. Does any one recognize it? What can i do to
>>reduce the interrupt to a minimum?
>
> Interrupts come with heavy disk activity or network activity, typically.
> You can see if either is occuring by running "systat" in its "vmstat"
> mode.
Aditional information:
I use the FreeBSD (4.4 former 4.3) computer as a internet server. The
normal use of the machine is not from behind that machine, but from
behind windows pc's. There are only a few machines that uses it
services, so i can prity much determen if there is a heavy network- or
harddisk load. The later i control to the fullest.
In normal use of the machine 50% of the CPU time goes to interrupted.
This is so incase of heavy internet / harddisk use, as well as none such
use, the other 50% is avilible.
I can easly increase the avilible CPU time to near 100% bye doing one of
two things. 1) Open a telnet or ssh connection and become root. This wil
give the 50% to outher processes for 5 minutes. Afther wich 50% goes to
interrupted. 2) Run to the FreeBSD computer and login either as normal
user or as root. This has the advantage that as long if someone is loged
in the avilible power of the machine is mostly 100%. When i logout then
this power gets reduces to 50%.
Both top as well systat in vmstat mode doesn't tell me anything for the
interrupt stuf. When the computer is not in use, then harddisk and the
nics are used very rearly. The harddisk once every 5 minutes for a
script and the NIC whore whatever. (both 4 interrupts). I see and know
of no reson what sould cause this. I had the same problem with v4.3.
Could this be a bug?
Alex
Output - systat :vmstat:
Interrupts
240 total
1 ed0 irq10
1 xl0 irq9
10 ata0 irc14
ata1 irc15
fdc0 irq6
atkbd0 irq?
ppc0 irc7
100 clk irq0
128 rtc irq8
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