Messages in this thread |  | | Date | Tue, 4 Oct 2016 12:27:59 -0400 | From | Tejun Heo <> | Subject | Re: [PATCH V3 00/11] block-throttle: add .high limit |
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Hello,
On Tue, Oct 04, 2016 at 06:22:28PM +0200, Paolo Valente wrote: > Could you please elaborate more on this point? BFQ uses sectors > served to measure service, and, on the all the fast devices on which > we have tested it, it accurately distributes > bandwidth as desired, redistributes excess bandwidth with any issue, > and guarantees high responsiveness and low latency at application and > system level (e.g., ~0 drop rate in video playback, with any background > workload tested).
The same argument as before. Bandwidth is a very bad measure of IO resources spent. For specific use cases (like desktop or whatever), this can work but not generally.
> Could you please suggest me some test to show how sector-based > guarantees fails?
Well, mix 4k random and sequential workloads and try to distribute the acteual IO resources.
Thanks.
-- tejun
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