From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Alan D. Brunelle" Date: Mon, 26 Mar 2007 03:51:00 +0000 Subject: Re: how to understand the Q2Q in btt result? Message-Id: <46074324.6020902@hp.com> List-Id: References: <1174876819.6887.2.camel@localhost.localdomain> In-Reply-To: <1174876819.6887.2.camel@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-btrace@vger.kernel.org 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 > > > - > To unsubscribe from this list: send the line "unsubscribe linux-btrace" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >