Mailinglist Archive: opensuse (4288 mails)

[Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>]

On Oct 30 2007 16:46, Aaron Kulkis wrote:
> > Because everyone knows that the disk
> > drive/SATA-bus/controller/PCI-bus/DMA are the limiting factors in raw
> > dd speed, so who cares how the kernel/app are compiled.
>
> But dd doesn't write to disk... it writes to buffers
> held in RAM, and then forgets about it, letting the
> system flush the buffers out to disk when needed.

Yes, and that is the problem. As soon as your data set is bigger than
the immediately available cache, write-out will happen and a speed
drop will be visible.
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