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vmstat i/o time shows 0 IO


© May 2019 Anthony Lawrence


From: Netocrat <netocrat@dodo.com.au>
Subject: Re: Why am I not using 100% of cpu?
Date: Thu, 18 Aug 2005 22:56:36 +1000
Message-ID: <pan.2005.08.18.12.56.36.564054@dodo.com.au> 
References: <wx0oe7wvf33.fsf@sws5.ornl.gov>
<ln0ct2-10m.ln1@news.it.uc3m.es>
<wx0fyt8v40w.fsf@sws5.ornl.gov>
<blect2-uat.ln1@news.it.uc3m.es>
<wx04q9ouy8m.fsf@sws5.ornl.gov>
<pan.2005.08.17.20.18.13.313615@dodo.com.au>
<wx0acjf8klt.fsf@sws5.ornl.gov> On Thu, 18 Aug 2005 09:01:34 -0400, Dave Sill wrote: > Netocrat <netocrat@dodo.com.au> writes: > >> Do you mean top or vmstat? In another post you wrote that the output was >> from vmstat, in which case perhaps your kernel version is too old. > > Both top and vmstat. > >> From the vmstat manpage: >> wa: Time spent waiting for IO. Prior to Linux 2.5.41, shown as zero. > > Well, that's bogus. If they're not reporting valid data, they should > make it look like valid data. If they'd used a dash instead of a 0, > I'd have known what was going on. Thanks for pointing that out. > > So now the question is: is I/O wait time counted as idle/system/user > time, or is it just not counted at all? I forgot to include the preceding line which would have made a difference; here they both are: id: Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time. wa: Time spent waiting for IO. Prior to Linux 2.5.41, shown as zero. -- https://members.dodo.com.au/~netocrat

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