[Cbe-oss-dev] ps3vram performance

[IsoH]

On 2009-09-05, IsoH wrote:

> 
>  Someone care to explain this (both have exactly same kernel):
> 
>    1st PS3; euro-model 60GB, 4xUSB, fw:1.6.0, kernel 2.6.31-rc7
> 
>         #dd if=/dev/zero of=/dev/ps3vram  count=229 bs=1M oflag=direct
>         229+0 records in
>         229+0 records out
>         240123904 bytes (240 MB) copied, 0.810645 s, 296 MB/s
> 
>         #dd if=/dev/ps3vram of=/dev/null bs=1M iflag=direct          
>         234+0 records in
>         234+0 records out
>         245366784 bytes (245 MB) copied, 0.560001 s, 438 MB/s
> 
> 
>    2nd PS3; euro-model 40GB, 2xUSB, fw:2.5.3, kernel 2.6.31-rc7
> 
>         #dd if=/dev/zero of=/dev/ps3vram  count=229 bs=1M oflag=direct
>         229+0 records in
>         229+0 records out
>         240123904 bytes (240 MB) copied, 14.5914 s, 16.5 MB/s
> 
>         #dd if=/dev/ps3vram of=/dev/null bs=1M iflag=direct
>         236+0 records in
>         236+0 records out
>         247463936 bytes (247 MB) copied, 7.59954 s, 32.6 MB/s
> 

 Obviously this speed difference has something to do with 
 fw-version ("< 2.0x" vs "> 2.0x"?). 
 Is there any way to work around this?


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IsoH