>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.
Cheers,
Malcolm
On 23 Jun 2014, Rob Kendrick wrote:
On Mon, Jun 23, 2014 at 07:04:53PM +0100, David Pitt wrote:Peter Young, on 23 Jun, wrote:I've been using the disc cache on RISC OS 2.19, ARMini, and I seem to have
found some downsides to it, and I wonder if (a) I'm doing it correctly and
(b) if it's worth the occasional faster opening of some sites.
If I load, for instance, http://www.bbc.co.uk/news/ as the first site of a
session, it loads maybe a little faster, but then I get intermittent
hourglass activity for sometimes up to thirty seconds, during which I
can't do anything else. There are several other sites, for instance
Wikipedia home page, which do the same. And the next day the same happens.
I have found much the same, a really good example of this is the Daily
Mail's heavy weight site.
Ultimately, my advice is to not visit this service. This stands
regardless of any cache issues that may exist :)http://www.dailymail.co.uk/home/index.html
Writes to the Raspberry Pi's SD Card are so slow that !Cache is not going to
be good news on it. It is better with !Cache on a Fat32 harddisc connected
to the Pi and on the Iyonix but is still an issue.
Indeed, SD has poor write performance almost anywhere, like most
flash-based devices.Overall I was not persuaded that the cache results is any meaningful speed
up and could even slow things up, not just on the Raspberry Pi but also on
the Iyonix and VRPC on a Windows 7 laptop with an SSD.
Certainly on UNIX and BeOS, it seems to provide a significant
performance boost, but this is probably because of their far superior IO
layers.
On RISC OS, the disc cache *may* only be a win for people on slow
connections.
B.
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