Messages in this thread | | | Date | Thu, 8 Dec 2022 00:35:55 +0000 | From | Keith Busch <> | Subject | Re: [RFC for-6.2/block V2] block: Change the granularity of io ticks from ms to ns |
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On Wed, Dec 07, 2022 at 11:17:12PM +0000, Chaitanya Kulkarni wrote: > On 12/7/22 15:08, Jens Axboe wrote: > > > > My default peak testing runs at 122M IOPS. That's also the peak IOPS of > > the devices combined, and with iostats disabled. If I enabled iostats, > > then the performance drops to 112M IOPS. It's no longer device limited, > > that's a drop of about 8.2%. > > > > Wow, clearly not acceptable that's exactly I asked for perf > numbers :).
For the record, we did say per-io ktime_get() has a measurable performance harm and should be aggregated.
https://www.spinics.net/lists/linux-block/msg89937.html
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