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Re: [PATCH 0/2] Introduce the request handling for dm-crypt

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On Friday 13 November 2015 10:05:28 Baolin Wang wrote:
> 
> Well, I did a simple test with dd reading, cause my engine limitation is 1M,
> (1) so the time like below when handle 1M at one time.
> 1048576 bytes (1.0 MB) copied, 0.0841235 s, 12.5 MB/s
> 1048576 bytes (1.0 MB) copied, 0.0836294 s, 12.5 MB/s
> 1048576 bytes (1.0 MB) copied, 0.0836526 s, 12.5 MB/s
> 
> (2) These handle 64K at one time * 16 times
> 1048576 bytes (1.0 MB) copied, 0.0937223 s, 11.2 MB/s
> 1048576 bytes (1.0 MB) copied, 0.097205 s, 10.8 MB/s
> 1048576 bytes (1.0 MB) copied, 0.0935884 s, 11.2 MB/s
> 
> Here is a 10ms level difference, try to image if the hardware engine's
> throughput is bigger than that. But like Jens said, we can measure it
> by the performance data.

The absolute numbers look really low. Does this include writing to
a hard drive? That would certainly make the difference appear
less significant.

Could you try backing this with a ram disk backing for comparison,
and also use 'time dd' to show the CPU utilization for all cases?
For completeness, including cpu-only performance might also help
put this into perspective.

	Arnd
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[PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-11 10:40 +0100
  [PATCH 1/2] block: Introduce BIO_ENDIO_FREE for bio flags Baolin Wang <baolin.wang@linaro.org> - 2015-11-11 10:40 +0100
    Re: [PATCH 1/2] block: Introduce BIO_ENDIO_FREE for bio flags Mike Snitzer <snitzer@redhat.com> - 2015-11-11 19:00 +0100
      Re: [PATCH 1/2] block: Introduce BIO_ENDIO_FREE for bio flags Baolin Wang <baolin.wang@linaro.org> - 2015-11-12 05:10 +0100
  Re: [PATCH 0/2] Introduce the request handling for dm-crypt Christoph Hellwig <hch@infradead.org> - 2015-11-11 10:50 +0100
    Re: [PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-12 03:20 +0100
      Re: [PATCH 0/2] Introduce the request handling for dm-crypt Jan Kara <jack@suse.cz> - 2015-11-12 10:20 +0100
        Re: [PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-12 10:50 +0100
          Re: [PATCH 0/2] Introduce the request handling for dm-crypt Jan Kara <jack@suse.cz> - 2015-11-12 12:10 +0100
            Re: [PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-12 12:50 +0100
              Re: [PATCH 0/2] Introduce the request handling for dm-crypt Jan Kara <jack@suse.cz> - 2015-11-12 13:30 +0100
                Re: [PATCH 0/2] Introduce the request handling for dm-crypt Arnd Bergmann <arnd@arndb.de> - 2015-11-12 14:00 +0100
                Re: [PATCH 0/2] Introduce the request handling for dm-crypt Mark Brown <broonie@kernel.org> - 2015-11-12 16:10 +0100
                Re: [PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-13 04:30 +0100
                Re: [PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-13 04:30 +0100
                Re: [PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-12 14:00 +0100
                Re: [PATCH 0/2] Introduce the request handling for dm-crypt Jan Kara <jack@suse.cz> - 2015-11-12 14:00 +0100
                Re: [PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-13 03:10 +0100
                Re: [PATCH 0/2] Introduce the request handling for dm-crypt Arnd Bergmann <arnd@arndb.de> - 2015-11-13 10:10 +0100
                Re: [PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-13 12:40 +0100
  Re: [PATCH 0/2] Introduce the request handling for dm-crypt Mike Snitzer <snitzer@redhat.com> - 2015-11-11 19:20 +0100
    Re: [PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-12 03:40 +0100
      Re: [dm-devel] [PATCH 0/2] Introduce the request handling for  dm-crypt Christoph Hellwig <hch@infradead.org> - 2015-11-12 10:10 +0100
    Re: [PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-12 09:30 +0100
      Re: [PATCH 0/2] Introduce the request handling for dm-crypt Mark Brown <broonie@kernel.org> - 2015-11-12 11:10 +0100
        Re: [PATCH 0/2] Introduce the request handling for dm-crypt Jens Axboe <axboe@kernel.dk> - 2015-11-12 16:30 +0100
          Re: [PATCH 0/2] Introduce the request handling for dm-crypt Baolin Wang <baolin.wang@linaro.org> - 2015-11-13 03:10 +0100
          Re: [PATCH 0/2] Introduce the request handling for dm-crypt Mark Brown <broonie@kernel.org> - 2015-11-13 13:00 +0100
    Re: [dm-devel] [PATCH 0/2] Introduce the request handling for  dm-crypt Christoph Hellwig <hch@infradead.org> - 2015-11-12 10:10 +0100

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