On Thu, Feb 21 2013, David N wrote: > Hi, > > I was using FIO to get response time of random reads and sequential > reads from phone's flash memory and I got like 9x greater response > time for random read. Since there is no seek time as in conventional > rotating storage, I'm wondering where this huge jump of random IO > response time comes from? How is the total IO delay actually > calculated in FIO? One option is that your sequential reads are coalesced and issued as one command, whereas random flash reads will still trigger a tread and tstream pause for each one. You need to look at device stats with the workload to see what the ratio between fio-request:device-request is. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
