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Date: Thu, 25 Nov 2010 18:38:08 +0200
From: Andriy Gapon <avg@freebsd.org>
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To: jhell <jhell@DataIX.net>
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Cc: Adam Vande More <amvandemore@gmail.com>, freebsd-stable@freebsd.org
Subject: Re: top io mode
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on 25/11/2010 18:03 jhell said the following:
> On 11/25/2010 06:28, Adam Vande More wrote:
>> top io doesn't seem to display stats when dealing direct with a block device
>> like so:
>>
>> dd if=/dev/ada0 of=/dev/null
>>
>> However if dd runs on a regular file eg
>>
>> dd if=test.file of=/dev/null
>>
>> then stats are reported in top.
>>
>> Is this the expected behavior?
>>
> 
> Is this on ZFS ?
> 
> If that is the case it is a known problem that needs the following patch
> to fix the issue.
> 
> http://people.freebsd.org/~avg/zfs-ru.diff
> 
> I believe it is planned to be MFC'd but am not quite sure so I have CC'd
> Andriy and he should be able to advise further.

I think that you got confused :-)
Read Adam's report again :-)

-- 
Andriy Gapon