Date: Tue, 20 Mar 2012 12:54:27 +0100 From: Ivan Voras <ivoras@freebsd.org> To: Matt Thyer <matt.thyer@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: 157k interrupts per second causing 60% CPU load on idle system Message-ID: <CAF-QHFWT4urs_JsXExEph94OyXU2ZHhDtitgwzUjvKciBLPgwQ@mail.gmail.com> In-Reply-To: <CACM2%2B-6-_ocDL=4-kz31ejOB2jDb9_hjXUYKJ0-xqNfK2esorg@mail.gmail.com> References: <CACM2%2B-46zHafjZo0O1dNNvEJm%2B2sUcYboBWwhJ8NxVhXyvpBZQ@mail.gmail.com> <jk9mv3$n6k$2@dough.gmane.org> <CACM2%2B-6-_ocDL=4-kz31ejOB2jDb9_hjXUYKJ0-xqNfK2esorg@mail.gmail.com>
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On 20 March 2012 12:52, Matt Thyer <matt.thyer@gmail.com> wrote: > On 20 March 2012 21:12, Ivan Voras <ivoras@freebsd.org> wrote: >> >> On 20/03/2012 06:26, Matt Thyer wrote: >> > I've upgraded my FreeBSD-STABLE NAS from r225723 (22nd Sept 2011) to >> > r232477 (4th Mar 2012) and am finding that a system process called >> > "intr" >> > is now constantly using about 60% of 1 CPU starting a short time after >> > reboot (possibly triggered by use of the samba server). >> > >> > When this starts, systat -vm 1 says that the system is 85% idle and 14% >> > interrupt handling. >> > It says that there's around 157k interrupts per second. >> > >> >> Ok, but *which* interrupt is getting triggered? Please send the output >> of "vmstat -i". >> >> > interrupt total rate > irq16: uhci0+ 3392184862 126692 Ok, something's probably wrong with USB. Can you disable it in BIOS? > cpu0: timer 53549677 1999 > irq256: mps0 2643187 98 > irq257: re0 5508108 205 > irq258: ahci0 160717 6 > cpu1: timer 53525300 1999 > cpu2: timer 53525300 1999 > cpu3: timer 53525296 1999 > Total 3614622447 134999 >
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