[systemd-devel] bootchart issues on slow hardware

Kok, Auke-jan H auke-jan.h.kok at intel.com
Mon Mar 18 14:47:38 PDT 2013

On Mon, Mar 18, 2013 at 2:30 PM, Holger Winkelmann <hw at travelping.com> wrote:
> Hi,
> Just a quick note, Systemd is a core function on a core OS.
> and a coreOS is likely to be started from flash drives. We have
> i.e. ATCA devices starting from eUSB Sticks or even SD cards.
> After they started the nodes could have high perfomance SSD drives
> mounted for payload data, or even not storrage mounted at all.
> a PID1 Software should be able to run from Flash Storrage in the
> same way as if the filessystem on fast (SSD) drives...

There's no real problem with running from any type of flash, as the
performance of SD cards is comparable to how an SSD behaves. While it
may be slower (a lot), the readahead performance characteristics are
identical (seek times are ~ zero).

I have not seen any problems running systemd from an SD card or USB
flash storage, and I don't expect there to be any.


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