Re: testing UBIFS with zstd

[Richard Weinberger <richard@sigma-star.at>]

Michele,

Am Mittwoch, 6. Juni 2018, 18:01:17 CEST schrieb Michele Dionisio:
> I have 2 partitions on same NAND. one with LZ4 one with ztsd. Mount option are:

LZ4 or LZO?
Below you write LZO...
 
> root@flexaT:/# mount
> rootfs on / type rootfs (rw)
> ubi0:data on /opt/device/data type ubifs (rw,noatime,bulk_read)
> ubi1:spare on /opt/device/real_spare type ubifs (rw,noatime,bulk_read)
> 
> I execute the following sequence of command for test
> 
> INFILE="/dev/zero"
> rm -f /tmp/testfile
> dd if=${INFILE} of=/tmp/testfile bs=16k count=1k
> rm -f /opt/device/data/test
> df /opt/device/data
> sysctl -w vm.drop_caches=3
> time dd if=/tmp/testfile of=/opt/device/data/test bs=64k count=1k
> sync
> sysctl -w vm.drop_caches=3
> time dd if=/opt/device/data/test of=/dev/null bs=64k
> df /opt/device/data
> rm -f /opt/device/data/test
> rm -f /opt/device/real_spare/test
> df /opt/device/real_spare
> sysctl -w vm.drop_caches=3
> time dd if=/tmp/testfile of=/opt/device/real_spare/test bs=64k count=1k
> sync
> sysctl -w vm.drop_caches=3
> time dd if=/opt/device/real_spare/test of=/dev/null bs=64k
> df /opt/device/real_spare
> rm -f /opt/device/real_spare/test
> rm -f /tmp/testfile
> 
> I have that the test 2 time using INFILE="/dev/zero" and
> INFILE="/dev/urandom". Both test is not realistic because zeros is too
> much comprimable and random is not comprimibile. The result is:
> 
> ----------------------------------------------------------------------------------------
> COMPRESSION           |  time write    | time read   |   space used
> LZO (/dev/zero)             |  2.39          | 1.40        |   624 blocks
> ZSTD (/dev/zero)           |  2.63          | 1.43        |   596 blocks
> LZO (/dev/urandom)    |  13.38         | 5.88        |   16024 blocks
> ZSTD (/dev/urandom)   |  7.89          | 5.83        |   15896 blocks

What scale is time? ms?
And what is block? LEBs?

Thanks,
//richard

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