On 19 August 2012 22:39, Greg Sullivan <greg.sullivan@xxxxxxxxxxxxx> wrote: > I'm finding that the throughput is varying wildly during a run - more > than I think is probably normal. It happens regardless of whether I > limit by data rate or io rate, although I think it's worse when I > limit by io. > > Here is a test job followed by the output. The io rate fluctuated > wildly - I watched it in the Windows Performance Monitor. The io rate > should be extremely easy to maintain. The "CR=80" looks suspicious - > why is there an 80 there when I requested 40? [stuff removed] I tried the same test on Ubuntu, and I think it's working properly - the iops figures displayed by fio are relatively constant as the test runs. (although I'm having trouble relating the the output of iostat to the actual workload that should be generated) I still get the CR=<double the requested rate> on Ubuntu, so I assume this is normal. The iops figures over on the right of the output look kosher. (as they do on Windows, except for the wide fluctuations) Greg. -- 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
