[Cbe-oss-dev] ps3vram performance

[IsoH]

 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






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IsoH