[Cbe-oss-dev] ps3vram performance

[Siarhei Siamashka]

On Wednesday 23 September 2009, Ken Werner wrote:
> I did some testing on a 40GB Model (CECHG04). Here are the numbers:
>
> # FW 2.7.6, Kernel 2.6.30.5-43.fc11.ppc64 (stock Fedora 11)
> # 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, 3.88861 s, 61.8 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, 1.96822 s, 126 MB/s
>
> # FW 3.0.1, Kernel 2.6.30.5-43.fc11.ppc64 (stock Fedora 11)
> # 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, 3.90034 s, 61.6 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, 1.9592 s, 126 MB/s
>
> # FW 3.0.1, Kernel 2.6.31-rc7 (ps3_defconfig)
> # 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, 14.612 s, 16.4 MB/s
> # dd if=/dev/ps3vram of=/dev/null bs=1M iflag=direct
> 245+0 records in
> 245+0 records out
> 256901120 bytes (257 MB) copied, 7.85136 s, 32.7 MB/s
>
> # FW 3.0.1, Kernel 2.6.31 (ps3_defconfig)
> # 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, 14.5785 s, 16.5 MB/s
> # dd if=/dev/ps3vram of=/dev/null bs=1M iflag=direct
> 245+0 records in
> 245+0 records out
> 256901120 bytes (257 MB) copied, 7.85101 s, 32.7 MB/s
>
> It looks like the firmware from 2.7.6 to 3.0.1 update has no impact but the
> kernel version does.

Thanks for the update. Did you investigate it further? I wonder if fc11 kernel
has a different config (some magic option which makes this huge difference) or
it has some important patch missing in the mainline?

Is there any way to get fedora kernel sources in a plain ready-to-be-compiled
tarball? Or a git tree? I tried to give a quick look at srpm, but I'm not sure
how one can unpack it correctly unless having fedora linux installed...

-- 
Best regards,
Siarhei Siamashka
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