axel lin wrote: > hi list, > I checked my moblin2 bootchart and found the maximum disk throughput > is only 8MB/s, > However I got 25.21 MB/sec if I test with hdparm -tT /dev/sda. > Why the number is so much different between bootchart and hdparm test?
several factors: - bootchart only shows 'average' usage for the programmed time interval, which is 0.2 secs by default. this doesn't properly show peak usage - booting a system is complex in resource usage, the cpu may be too busy to schedule all the IO requests quickly enough - it's practically impossible to achieve max throughput when the system is busy with other tasks, such as initializing pieces of hardware etc... - system variation, such as controller options (NCQ/queueing etc). Auke _______________________________________________ Moblin dev Mailing List dev@moblin.org To manage or unsubscribe from this mailing list visit: https://lists.moblin.org/mailman/listinfo/dev or your user account on http://moblin.org once logged in. For more information on the Moblin Developer Mailing lists visit: http://moblin.org/community/mailing-lists
