Re: [PATCH] brd: use XArray instead of radix-tree to index backing pages

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On 2023-05-12 10:34, Chaitanya Kulkarni wrote:
> On 5/12/23 01:17, Pankaj Raghav wrote:
>>>> [1] Performance in KIOPS:
>>>>
>>>>             |  radix-tree |    XArray  |   Diff
>>>>             |             |            |
>>>> write     |    315      |     313    |   -0.6%
>>>> randwrite |    286      |     290    |   +1.3%
>>>> read      |    330      |     335    |   +1.5%
>>>> randread  |    309      |     312    |   +0.9%
>>>>
>>> I've few concerns, can you please share the fio jobs that
>>> have used to gather this data ? I want to test it on my
>>> setup in order to provide tested-by tag.
>>>
>> That would be great. This is my fio job:
>>
>> $ modprobe brd rd_size=10485760 rd_nr=1
>> $ fio --name=brd  --rw=<type>  --size=10G --io_size=100G --cpus_allowed=1 --filename=/dev/ram0
>> --direct=1 --iodepth=64 --ioengine=io_uring --loop=8
>>
>> I ran the above job four times and averaged it as I noticed some variance. I ran the test in QEMU
>> as we were using a block device where the backing storage lives in RAM.
>>
> 
> Please also share the numbers on non-virtualized platform i.e. with not 
> QEMU.

I am running this on the next-20230512 in an Intel(R) Xeon(R) CPU E3-1240 v6 with 32GB RAM:

              |  radix-tree |    XArray  |   Diff
              |             |            |
    write     |    532      |     527    |   -0.9%
    randwrite |    456      |     452    |   -0.8%
    read      |    557      |     550    |   -1.2%
    randread  |    493      |     495    |   +0.4%



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