9fans - fans of the OS Plan 9 from Bell Labs
 help / color / mirror / Atom feed
From: "Nigel Roles" <nigel@9fs.org>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu>
Subject: RE: [9fans] interrupts (non-plan9 related)
Date: Tue, 12 Apr 2005 18:28:57 +0100	[thread overview]
Message-ID: <HOEHIDJJJINMLFPOLFJCAECMDGAA.nigel@9fs.org> (raw)
In-Reply-To: <439d9767ddd20378da8de3abb8972eb9@plan9.ucalgary.ca>

9fans-bounces+ngr=9fs.org@cse.psu.edu wrote:
> i've got a dual-cpu machine running linux.  i'm looking at sar reports
> for the box and can't really understand what happens -- the machine
> services all interrupts at CPU0 (actually the first hyperthreaded
> part of CPU0). 
> 
> is this supposed to be normal?
> 
> here is how the interrupts were reported just before a major crash:
> 
> 
> 
> 21:30:48 PM CPU i000/s i001/s i002/s i008/s i011/s i014/s i027/s
> i028/s i029/s i030/s 21:30:58 PM 0 99.90 0.00 0.00 0.00 0.00 0.00
> 500.60 1.80 671.90 4.30 21:30:58 PM 1 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 0.00 0.00 21:30:58 PM 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 0.00 21:30:58 PM 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 21:31:08 PM 0 100.00 0.00 0.00 0.00 0.00 0.00 639.80 0.00
> 2570.20 4.10 21:31:08 PM 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 21:31:08 PM 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 21:31:08 PM 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> Average:       0  100.00    0.00    0.00    0.00    0.00    0.00
> 146.48    0.60 2671.07 1318.77
> Average:       1    0.00    0.00    0.00    0.00    0.00    0.00
>   0.00    0.00    0.00    0.00
> Average:       2    0.00    0.00    0.00    0.00    0.00    0.00
>   0.00    0.00    0.00    0.00
> Average:       3    0.00    0.00    0.00    0.00    0.00    0.00
>   0.00    0.00    0.00    0.00

Yes, quite normal.
You have to manually assign interrupts to different processors
if you want to spread the load.



      reply	other threads:[~2005-04-12 17:28 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-04-12 17:22 andrey mirtchovski
2005-04-12 17:28 ` Nigel Roles [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=HOEHIDJJJINMLFPOLFJCAECMDGAA.nigel@9fs.org \
    --to=nigel@9fs.org \
    --cc=9fans@cse.psu.edu \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).