From: "Alan D. Brunelle" <alan.brunelle@hp.com>
To: linux-btrace@vger.kernel.org
Subject: Re: how to understand the Q2Q in btt result?
Date: Mon, 26 Mar 2007 03:51:00 +0000 [thread overview]
Message-ID: <46074324.6020902@hp.com> (raw)
In-Reply-To: <1174876819.6887.2.camel@localhost.localdomain>
Ming Zhang wrote:
> from btt user guide
>
> "Q2Q which measures the time between queue traces in the system.
> This provides some idea as to how quickly IOs are being handed to
> the block IO layer."
>
> does this mean the time between queuing N request and N
> +1 request?
>
Hi Ming -
This is the average time between the Q traces being logged. We take the
difference between each succeeding Q trace, and divide the sum by the total.
Alan
> thanks!
>
> Ming
>
>
> -
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next prev parent reply other threads:[~2007-03-26 3:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-26 2:40 how to understand the Q2Q in btt result? Ming Zhang
2007-03-26 3:51 ` Alan D. Brunelle [this message]
2007-03-26 13:30 ` Ming Zhang
2007-03-26 13:58 ` Alan D. Brunelle
2007-03-26 15:00 ` Ming Zhang
2007-03-26 15:09 ` Alan D. Brunelle
2007-03-26 15:21 ` Ming Zhang
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