Re: [PATCH 1/2] block: Optimize blk_mq_submit_bio() for the cache hit scenario

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On Tue, Dec 17, 2024 at 11:22:47AM -0800, Bart Van Assche wrote:
> For a single CPU core and with the brd driver and fio and the io_uring
> I/O engine, I see the following performance in a VM (three test runs for
> each test case):
>
> Without this patch:      1619K, 1641K, 1638K IOPS or 1633 K +/- 10 K.
> With this patch applied: 1650K, 1633K, 1635K IOPS or 1639 K +/-  8 K.
>
> So there is a small performance improvement but the improvement is
> smaller than the measurement error. Is this sufficient data to proceed
> with this patch?

I think it's sufficient data that should not claim that it is an
optimizations.  The resulting code still looks nicer to me, but
arguing with optimizations feels like BS.





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