 Show Posts
|
|
Pages: 1 2 [3] 4 5 ... 10
|
|
32
|
General Category / General Discussion / Re: Compiler settings affect floating point performance?
|
on: April 23, 2010, 11:51:24 AM
|
|
-Os reduces code size, not data size. The knee in the chart shows what happens when the data gets bigger than the data cache. I don't think -Os will help you. Sorry.
The example in the chart uses a 16KB(yte) data cache. The Sheeva core in the Plug has a 256KB L2 unified cache to go along with a 16KB L1 data only cache. (there is a dedicated 16KB L1 instruction cache as well) While not enormous, the second level of cache should help move the knee to the right on that chart.
|
|
|
|
|
33
|
Linux Stuff / General Linux questions / Re: hwclock drift
|
on: April 22, 2010, 12:27:31 PM
|
|
As fragfutter said, using ntpd with recent kernels offers the capability of dramatically reducing, but not eliminating, running clock drift. One caveat: you need to run the plug for about 15 minutes with it hooked to a network with an available ntp server (the internet) for the ntpd algorithms to have enough difference data to do proper drift analysis.
FYI, no matter how good the drift analysis is, the longer the plug is not connected to a ntp server or stratum-0 device (atomic clock, GPS, radio clock, etc), the more drift it will have. This is true whether the plug is running or not.
|
|
|
|
|
39
|
Hardware and U-Boot firmware / Hardware / Re: GuruPlug I2C
|
on: April 13, 2010, 12:09:40 PM
|
Schematics would help, eh?  I don't expect a connector on the outside of the case; but, a connector on the "motherboard" (like the 1.3 plug) or even accessible solder pads would be usable. |
|
|
|
|
41
|
General Category / General Discussion / Re: Is GuruPlug shipping yet?
|
on: April 01, 2010, 10:25:58 AM
|
I just now received this from sales@globalscaletechnologies.com. I did not contact them. This was pro-active on their part: Dear Customer,
Thank you for your order.
This is an updated notice of your GuruPlug Server (Standard version, PLUS version) order status.
Due to CE & FCC certifications process delay, we are expected to ship your order at the end of April once the certifications are confirmed.
Thank you for your understanding and patience.
Best Regard,
Globalscale Technologies, Inc.
Disclaimer: This e-mail message and all attachments transmitted with it are intended solely for the use of the addressee and may contain legally privileged and confidential information. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, copying, or other use of this message or its attachments is strictly prohibited. If you have received this message in error, please notify the sender immediately by replying to this message and please delete it from your computer. Any views expressed in this message are those of the individual sender unless otherwise stated. Company has taken enough precautions to prevent the spread of viruses. However the company accepts no liability for any damage caused by any virus transmitted by this email. |
|
|
|
|
45
|
Hardware and U-Boot firmware / Hardware / Re: Underclocking the Sheevaplug
|
on: March 30, 2010, 02:21:25 PM
|
The processor in a plug is a Marvell Kirkwood 88F6281. Here is a link to the Marvell Kirkwood page. According to the table, this processor can go down to 1 Ghz. I *think* I remember reading somewhere that the clock speed used affects the speed of the memory that can be attached to the device as well so dropping the clock speed may not be the only thing you'd need to tweek. Sorry, I don't have a better memory. |
|
|
|
|
