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

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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.

-ck






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