RAID6 rmw - new numbers

RAID6 rmw - new numbers

[Markus Stockhausen]

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Hello,

I had some time for additional benchmarks. My initial numbers
were too low because I didn't push the system to its limits with
high parallelism.

Test program http://www.corpit.ru/mjt/iot.c
settings: 180 seconds random write, 3 runs, 64 threads, direct I/O
command line: iot -d -W64 -b <blocksize> -t 180 /dev/md0

bsize    w/o patch   w/o patch   w/o patch
               min         avg         max
   4K      317KB/s     318KB/s     319KB/s
   8K      611KB/s     614KB/s     617KB/s
  16K     1153KB/s    1153KB/s    1154KB/s
  32K     2239KB/s    2253KB/s    2263KB/s
  64K     3944KB/s    3959KB/s    3978KB/s
 128K     7792KB/s    7891KB/s    8025KB/s
 256K    15456KB/s   15574KB/s   15805KB/s
 512K    32406KB/s   32564KB/s   32799KB/s
1024K    57378KB/s   57965KB/s   58550KB/s

bsize   with patch  with patch  with patch    real  math gain
               min         avg         max    gain  in theory
   4K      417KB/s     420KB/s     423KB/s  +32,1%       +66%
   8K      806KB/s     818KB/s     826KB/s  +33,2%       +66%
  16K     1504KB/s    1518KB/s    1531KB/s  +31,6%       +66%
  32K     2993KB/s    3001KB/s    3016KB/s  +33,2%       +66%
  64K     5396KB/s    5477KB/s    5543KB/s  +38,3%       +66%
 128K     8971KB/s    9082KB/s    9169KB/s  +15,1%       +25%
 256K    15406KB/s   15545KB/s   15751KB/s   -0,2%         0%
 512K    32361KB/s   32619KB/s   32981KB/s   +0,1%         0%
1024K    58134KB/s   58239KB/s   58419KB/s   +0,4%         0%

As I got no feedback from Neil until now:

- Shall I resend the patches with the new numbers?
- What else can I do to push the patches further?

Markus=

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Re: RAID6 rmw - new numbers

[NeilBrown]

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On Sun, 31 Aug 2014 16:05:50 +0000 Markus Stockhausen
<stockhausen@collogia.de> wrote:

> Hello,
> 
> I had some time for additional benchmarks. My initial numbers
> were too low because I didn't push the system to its limits with
> high parallelism.
> 
> Test program http://www.corpit.ru/mjt/iot.c
> settings: 180 seconds random write, 3 runs, 64 threads, direct I/O
> command line: iot -d -W64 -b <blocksize> -t 180 /dev/md0
> 
> bsize    w/o patch   w/o patch   w/o patch
>                min         avg         max
>    4K      317KB/s     318KB/s     319KB/s
>    8K      611KB/s     614KB/s     617KB/s
>   16K     1153KB/s    1153KB/s    1154KB/s
>   32K     2239KB/s    2253KB/s    2263KB/s
>   64K     3944KB/s    3959KB/s    3978KB/s
>  128K     7792KB/s    7891KB/s    8025KB/s
>  256K    15456KB/s   15574KB/s   15805KB/s
>  512K    32406KB/s   32564KB/s   32799KB/s
> 1024K    57378KB/s   57965KB/s   58550KB/s
> 
> bsize   with patch  with patch  with patch    real  math gain
>                min         avg         max    gain  in theory
>    4K      417KB/s     420KB/s     423KB/s  +32,1%       +66%
>    8K      806KB/s     818KB/s     826KB/s  +33,2%       +66%
>   16K     1504KB/s    1518KB/s    1531KB/s  +31,6%       +66%
>   32K     2993KB/s    3001KB/s    3016KB/s  +33,2%       +66%
>   64K     5396KB/s    5477KB/s    5543KB/s  +38,3%       +66%
>  128K     8971KB/s    9082KB/s    9169KB/s  +15,1%       +25%
>  256K    15406KB/s   15545KB/s   15751KB/s   -0,2%         0%
>  512K    32361KB/s   32619KB/s   32981KB/s   +0,1%         0%
> 1024K    58134KB/s   58239KB/s   58419KB/s   +0,4%         0%
> 
> As I got no feedback from Neil until now:
> 
> - Shall I resend the patches with the new numbers?
> - What else can I do to push the patches further?

Sorry I've been silent - there has been lots of other stuff happening.
Thanks for the extra testing - it definitely looks good.
I'll try to move this along soon, no need to resend.

Thanks,
NeilBrown


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