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From: Werner Griessl <croot@btp1da.phy.uni-bayreuth.de>
Message-Id: <199605301654.QAA16142@btp1da.phy.uni-bayreuth.de>
Subject: Re: Excessive interrupts question
To: robmel@nadt.org.uk (Robin Melville)
Date: Thu, 30 May 1996 16:54:47 +0000 ()
Cc: questions@freebsd.org
In-Reply-To: <v01530501add360498bbb@[194.155.224.204]> from Robin Melville at "May 30, 96 03:31:26 pm"
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> 
> 
> >> I have 2.1 running on a Hewlett Packard NetServer with a NE2000 clone ether
> >> card and HP-doctored Adaptech 7770 on-board scsi with one 2Gb disk.
> >>
> >> It runs ok but very sluggishly. Checking with xperfmon++ I discover that
> >> something's generating 20k+ interrupts per second. Can anyone suggest what
> >> I should do to solve this?
> 
> >
> >Try "vmstat -i" to identify the interrupt source
> >
> >Werner
> 
> >I'd immediately suspect the NE2000.  This is a well-known CPU hog in
> >Novell servers.
> >
> >[ Michael ]
> 
> vmstat -i shows:
> 
> interrupt      total      rate
> clk0 irq0    95305809       99
> rtc0 irq8      104534        0
> fdc0 irq6           1        0
> ahc1 irq11    9696467       10
> sc0 irq1            5        0
> sio0 irq4           2        0
> sio1 irq3           2        0
> ed1 irq5      7469608        7
> Total        112576428      118
> 
> This is a different picture from that supplied by xperfmon (?). Are these
> interrupts excessive?
> 
> Thanx again ....
> 
> Robin.
> 
> -----------------------------------------------

Looks very normal except the rtc0 .

Here is my "vmstat -i":

interrupt      total      rate
clk0 irq0     9169027      100
rtc0 irq8    11734233      127
fdc0 irq6           1        0
wdc0 irq14    3465496       37
sio0 irq4           9        0
vt0 irq1          259        0
ed0 irq5      3211171       35
Total        27580196      300

Werner