Re: [PATCH 0/5] multiple block allocation to current ext3

[Andrew Morton]

Mingming Cao <cmm@xxxxxxxxxx> wrote:
>
> Tests done so far includes fsx,tiobench and dbench. The following
>  numbers collected from Direct IO tests (1G file creation/read)  shows
>  the system time have been greatly reduced (more than 50% on my 8 cpu
>  system) with the patches.
> 
>  1G file DIO write:
>  	2.6.15		2.6.15+patches
>  real    0m31.275s	0m31.161s
>  user    0m0.000s	0m0.000s
>  sys     0m3.384s	0m0.564s 
> 
> 
>  1G file DIO read:
>  	2.6.15		2.6.15+patches
>  real    0m30.733s	0m30.624s
>  user    0m0.000s	0m0.004s
>  sys     0m0.748s	0m0.380s
> 
>  Some previous test we did on buffered IO with using multiple blocks
>  allocation and delayed allocation shows noticeable improvement on
>  throughput and system time.

I'd be interested in seeing benchmark results for the common
allocate-one-block case - just normal old buffered IO without any
additional multiblock patches.   Would they show any regression?
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