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Message-ID: <Y5Exa1TV/2VLcEWR@kbusch-mbp>
Date: Thu, 8 Dec 2022 00:35:55 +0000
From: Keith Busch <kbusch@...nel.org>
To: Chaitanya Kulkarni <chaitanyak@...dia.com>
Cc: Jens Axboe <axboe@...nel.dk>,
Gulam Mohamed <gulam.mohamed@...cle.com>,
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Subject: Re: [RFC for-6.2/block V2] block: Change the granularity of io ticks
from ms to ns
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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