samba performance difference between old and the latest ?

[Namjae Jeon]

2019-09-07 1:18 GMT+09:00, Jeremy Allison via samba-technical
<samba-technical at lists.samba.org>:
> On Fri, Sep 06, 2019 at 11:01:51AM +0900, Namjae Jeon via samba-technical
> wrote:
>> Hello,
>>
>> I found something strange during measuring performance with samba these
>> days.
>> I checked the performance of samba 4.7.6 and 4.10.6.
>> There seems to be about 20% performance difference between the two
>> versions.
>>
>> Test environment
>>  1. use iozone and dd utils
>>  2. share is tmpfs
>>  3. smb client is kernel cifs client
>>  4. oplock disable, oplock = no
>>  4. command : ./iozone -s1g -r4 -e -i 0 -t 1 -b 24m.xls -+u
>>
>> with samba 4.7.6
>> 	Children see throughput for  1 initial writers 	=   11248.48 kB/sec
>> 	Parent sees throughput for  1 initial writers 	=   11248.28 kB/sec
>> 	Min throughput per process 			=   11248.48 kB/sec
>> 	Max throughput per process 			=   11248.48 kB/sec
>> 	Avg throughput per process 			=   11248.48 kB/sec
>> 	Min xfer 					= 1048576.00 kB
>> 	CPU Utilization: Wall time   93.219    CPU time   29.517    CPU
>> utilization
>>
>> with samba 4.10.6
>> Children see throughput for  1 initial writers 	=    9018.82 kB/sec
>> 	Parent sees throughput for  1 initial writers 	=    9018.70 kB/sec
>> 	Min throughput per process 			=    9018.82 kB/sec
>> 	Max throughput per process 			=    9018.82 kB/sec
>> 	Avg throughput per process 			=    9018.82 kB/sec
>> 	Min xfer 					= 1048576.00 kB
>> 	CPU Utilization: Wall time  116.265    CPU time   33.182    CPU
>> utilization
>>
>>
>> ================================================================================
>> ========
>> dd test result is same with iozone result.
>>
>> samba 4.7.6 : 11.6MB/s
>> samba 4.10.6 : 9.5MB/s
>>
>> with samba 4.7.6 :
>> root at test1234-Samsung-DeskTop-System:/mnt/read# dd if=/dev/zero of=1.txt
>> bs=4096
>> count=1024
>> 1024+0 records in
>> 1024+0 records out
>> 4194304 bytes (4.2 MB, 4.0 MiB) copied, 0.360991 s, 11.6 MB/s
>>
>> with samba 4.10.6 :
>> root at test1234-Samsung-DeskTop-System:/mnt/read# dd if=/dev/zero of=1.txt
>> bs=4096
>> count=1024
>> 1024+0 records in
>> 1024+0 records out
>> 4194304 bytes (4.2 MB, 4.0 MiB) copied, 0.442567 s, 9.5 MB/s
>>
>> Am I missing something? or real issue ?
>
> Is this on identical kernel versions ?
Yes, I compared two versions in the same test environment.
>
>