Tuesday, 24 June 2014

Re: Disc cache worth it?

Malcolm Hussain-Gambles, on 23 Jun, wrote:

> Just for a positive, I have a panda board my Internet connection is
> 120mbit. I do notice a difference.

The Panda is going to be faster than a Raspberry Pi.

> From my understanding and benchmarks the sd card can write at 20MB/sec
> and the fastest tcp I can get is 6MB/sec read and that's off a local
> webserver for testing purposes.

> So I can't see how it would be slower to be honest. I'm slightly confused.

As I understand it the small file write speed even on supposedly fast SD
cards can be very slow. This certainly seems to be the case on the Pi. It
first became really apparent after a particularly long winded !PackMan
installation. A large number of small files is a problem. External drives
are better but are only USB1.

!Cache on a RamDisc looks much more promising. This is much better, the
improvement is clear, and the machine is not taken over as the cache is
written.

--
David Pitt

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